diff --git a/src/components/Alert/Alert.tsx b/src/components/Alert/Alert.tsx
index 4e42e5e..7d8f921 100644
--- a/src/components/Alert/Alert.tsx
+++ b/src/components/Alert/Alert.tsx
@@ -1,7 +1,7 @@
-import { useMemo, useRef, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 
 import AlertCard from "./AlertCard";
-import useAlarm from "./hooks/useAlarm";
+import useAlerts from "./hooks/useAlerts";
 
 import {
   Active as ActiveAlarmIcon,
@@ -10,25 +10,29 @@ import {
 } from "@/assets/icon";
 import useIntersection from "@/hooks/useIntersection";
 import useOutsideClick from "@/hooks/useOutsideClick";
+import useRemoveTopPageScroll from "@/hooks/useRemoveTopPageScroll";
 
 interface AlertProps {
   userId: string;
 }
 
 function Alert({ userId }: AlertProps) {
-  const [showDropdown, setShowDropdown] = useState(false);
-  const { isLoading, hasNext, refetch, alerts, totalCount } = useAlarm({
-    userId,
-  });
-
-  const hasAlarm = useMemo(
-    () => alerts.filter(({ read }) => !read).length > 0,
-    [alerts],
-  );
-  const AlarmIcon = hasAlarm ? ActiveAlarmIcon : InactiveAlarmIcon;
+  const { isLoading, hasNext, hasAlarm, refetch, alerts, totalCount } =
+    useAlerts({
+      userId,
+    });
+  const [showDropdown, setShowDropdown] = useState<boolean>(false);
+  const [hasUnreadAlarm, setHasUnreadAlarm] = useState<boolean>(false);
 
   const buttonRef = useRef<HTMLButtonElement>(null);
   const wrapperRef = useRef<HTMLDivElement>(null);
+  const targetRef = useIntersection<HTMLDivElement>({
+    callback: ([entry]) => {
+      if (entry.isIntersecting && !isLoading && hasNext) {
+        refetch();
+      }
+    },
+  });
 
   const onToggleAlarm = () => {
     setShowDropdown((prev) => !prev);
@@ -39,14 +43,19 @@ function Alert({ userId }: AlertProps) {
     callback: () => setShowDropdown(false),
   });
 
-  const targetRef = useIntersection({
-    callback: ([entry]) => {
-      if (entry.isIntersecting && !isLoading && hasNext) {
-        refetch();
-      }
-    },
+  useRemoveTopPageScroll({
+    observeDevices: ["mobile"],
+    condition: showDropdown,
   });
 
+  useEffect(() => {
+    setHasUnreadAlarm(hasAlarm);
+  }, [hasAlarm]);
+
+  useEffect(() => {
+    setHasUnreadAlarm(false);
+  }, [showDropdown]);
+
   return (
     <div className="relative flex items-center justify-center">
       <button
@@ -54,29 +63,30 @@ function Alert({ userId }: AlertProps) {
         className="cursor-pointer"
         onClick={onToggleAlarm}
       >
-        <AlarmIcon className="h-6" />
+        {hasUnreadAlarm ? (
+          <ActiveAlarmIcon className="h-6" />
+        ) : (
+          <InactiveAlarmIcon className="h-6" />
+        )}
+        {/* <AlarmIcon className="h-6" /> */}
       </button>
       {showDropdown && (
         <div
           ref={wrapperRef}
-          className="fixed sm:absolute inset-0 sm:inset-auto sm:top-8 sm:right-0 z-20 sm:w-[23rem] sm:h-[26.875rem] py-6 px-5 rounded-[0.625rem] bg-red-10 border border-gray-30 text-left"
+          className="fixed sm:absolute inset-0 sm:inset-auto sm:top-8 sm:right-0 z-20 sm:w-[23rem] sm:h-[26.875rem] py-6 px-5 sm:rounded-[0.625rem] bg-red-10 border border-gray-30 text-left"
         >
           <p className="flex justify-between mb-4 text-left text-xl">
-            알림 {totalCount}개{" "}
+            알림 {totalCount}개
             <Close
-              className="md:hidden w-6 h-6 cursor-pointer"
+              className="sm:hidden w-6 h-6 cursor-pointer"
               onClick={onToggleAlarm}
             />
           </p>
           <ul className="flex flex-col gap-2 h-[calc(100%-2.75rem)] sm:h-[20.625rem] font-normal overflow-y-auto">
-            {alerts.map((alert, index) => (
-              <AlertCard
-                key={alert.id}
-                ref={index === alerts.length - 1 ? targetRef : null}
-                userId={userId}
-                alert={alert}
-              />
+            {alerts.map((alert) => (
+              <AlertCard key={alert.id} userId={userId} alert={alert} />
             ))}
+            <div ref={targetRef} />
             {isLoading && "로딩 중 ..."}
           </ul>
         </div>
diff --git a/src/components/Alert/AlertCard.tsx b/src/components/Alert/AlertCard.tsx
index 1e8e60d..0c9d8a2 100644
--- a/src/components/Alert/AlertCard.tsx
+++ b/src/components/Alert/AlertCard.tsx
@@ -1,4 +1,4 @@
-import { forwardRef, Ref, useState } from "react";
+import { forwardRef, Ref } from "react";
 
 import { putAlert } from "@/apis/services/alertService";
 import useIntersection from "@/hooks/useIntersection";
@@ -14,16 +14,13 @@ interface AlertCardProps {
 const AlertCard = forwardRef(
   ({ alert, userId }: AlertCardProps, ref: Ref<HTMLLIElement>) => {
     const { id, shop, notice, read, result, createdAt } = alert;
-    const [readStatus, setReadStatus] = useState(read);
+
+    const isAccepted = result === "accepted";
 
     const targetRef = useIntersection({
       callback: async ([entry]) => {
         if (entry.isIntersecting && userId && !read) {
-          const result = await putAlert(userId, id);
-
-          if (result.status === 200) {
-            setReadStatus(result.data.items[0].item.read);
-          }
+          await putAlert(userId, id);
         }
       },
     });
@@ -36,17 +33,15 @@ const AlertCard = forwardRef(
         <span
           className={cn(
             "inline-block my-1 w-[0.3125rem] h-[0.3125rem] rounded-full",
-            readStatus ? "bg-blue-20" : "bg-red-40",
+            isAccepted ? "bg-blue-20" : "bg-red-40",
           )}
         />
         <p className="text-sm">
           {shop.item.name}(
           {formatTimeRange(notice.item.startsAt, notice.item.workhour)}) 공고
           지원이{" "}
-          <strong
-            className={result === "accepted" ? "text-blue-20" : "text-red-40"}
-          >
-            {result === "accepted" ? "승인" : "거절"}
+          <strong className={isAccepted ? "text-blue-20" : "text-red-40"}>
+            {isAccepted ? "승인" : "거절"}
           </strong>
           되었어요.
         </p>
diff --git a/src/components/Alert/hooks/useAlarm.ts b/src/components/Alert/hooks/useAlerts.ts
similarity index 72%
rename from src/components/Alert/hooks/useAlarm.ts
rename to src/components/Alert/hooks/useAlerts.ts
index f093ff5..6a35767 100644
--- a/src/components/Alert/hooks/useAlarm.ts
+++ b/src/components/Alert/hooks/useAlerts.ts
@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 
 import { getAlerts } from "@/apis/services/alertService";
 import { AlertItem } from "@/types/alert";
@@ -9,18 +9,17 @@ interface UseAlarmParams {
   limit?: number;
 }
 
-const useAlarm = ({ userId, offset = 5, limit = 5 }: UseAlarmParams) => {
+const useAlerts = ({ userId, offset = 10, limit = 10 }: UseAlarmParams) => {
   const [isLoading, setIsLoading] = useState(false);
   const [totalCount, setTotalCount] = useState<number>(0);
   const [alerts, setAlerts] = useState<AlertItem[]>([]);
   const [hasNext, setHasNext] = useState(false);
+  const [hasAlarm, setHasAlarm] = useState(false);
 
-  const hasFetched = useRef(false);
   const pageRef = useRef(1);
 
-  const fetchAlerts = async () => {
+  const fetchAlerts = useCallback(async () => {
     setIsLoading(true);
-
     try {
       const fetchedAlerts = await getAlerts(
         userId,
@@ -29,8 +28,11 @@ const useAlarm = ({ userId, offset = 5, limit = 5 }: UseAlarmParams) => {
       );
       const nextAlerts = fetchedAlerts.data.items.map(({ item }) => item);
 
+      const hasUnreadAlert = nextAlerts.filter(({ read }) => !read).length > 0;
+
       setAlerts((prev) => [...prev, ...nextAlerts]);
       setHasNext(fetchedAlerts.data.hasNext);
+      setHasAlarm(hasUnreadAlert);
       setTotalCount(fetchedAlerts.data.count);
 
       if (fetchedAlerts.data.hasNext) {
@@ -39,22 +41,20 @@ const useAlarm = ({ userId, offset = 5, limit = 5 }: UseAlarmParams) => {
     } finally {
       setIsLoading(false);
     }
-  };
+  }, [userId, offset, limit]);
 
   useEffect(() => {
-    if (hasFetched.current) return;
-    hasFetched.current = true;
-
     fetchAlerts();
-  }, [userId, offset, limit]);
+  }, [userId, fetchAlerts]);
 
   return {
     refetch: fetchAlerts,
-    hasNext,
     alerts,
-    isLoading,
     totalCount,
+    hasNext,
+    hasAlarm,
+    isLoading,
   };
 };
 
-export default useAlarm;
+export default useAlerts;
diff --git a/src/components/Dropdown/FilterDropdownContent.tsx b/src/components/Dropdown/FilterDropdownContent.tsx
index 58f2647..ad0a1b4 100644
--- a/src/components/Dropdown/FilterDropdownContent.tsx
+++ b/src/components/Dropdown/FilterDropdownContent.tsx
@@ -13,11 +13,13 @@ import { extractDigits, numberCommaFormatter } from "@/utils/number";
 import "react-datepicker/dist/react-datepicker.css";
 
 interface FilterDropdownContentProps {
-  onClickApplyButton: () => void;
+  refetch: () => void;
   onClose: () => void;
+  onClickApplyButton: () => void;
 }
 
 function FilterDropdownContent({
+  refetch,
   onClose,
   onClickApplyButton,
 }: FilterDropdownContentProps) {
@@ -75,11 +77,12 @@ function FilterDropdownContent({
     setPayFilter(null);
     setStartDateFilter(null);
     setAreasFilter([]);
+    refetch();
   };
 
   return (
     <div className="flex flex-col w-full h-full sm:w-[24.375rem] text-black text-sm relative">
-      <div className="pt-6 pb-20 sm:pt-6 px-5 overflow-y-auto">
+      <div className="pt-6 pb-20 sm:pb-0 sm:pt-6 px-5 overflow-y-auto">
         <div className="pb-6 flex justify-between items-center">
           <span className="text-xl font-bold">상세 필터</span>
           <button onClick={onClose} className="cursor-pointer">
diff --git a/src/components/NoticeSearchResultHeader.tsx b/src/components/NoticeSearchResultHeader.tsx
index 1794b85..7e39b1d 100644
--- a/src/components/NoticeSearchResultHeader.tsx
+++ b/src/components/NoticeSearchResultHeader.tsx
@@ -6,6 +6,7 @@ import Button from "@/components/Button";
 import FilterDropdownContent from "@/components/Dropdown/FilterDropdownContent";
 import Select from "@/components/Select";
 import useOutsideClick from "@/hooks/useOutsideClick";
+import useRemoveTopPageScroll from "@/hooks/useRemoveTopPageScroll";
 import { SORT_OPTIONS } from "@/pages/NoticeSearchPage/constantsCopy";
 import { useFilterStore } from "@/store/useFilterStore";
 import type { SortKey } from "@/types/notice";
@@ -44,6 +45,11 @@ export default function NoticeSearchResultHeader({
     callback: () => setShowFilter(false),
   });
 
+  useRemoveTopPageScroll({
+    observeDevices: ["mobile"],
+    condition: showFilter,
+  });
+
   const handleSortChange = (value: string) => {
     onChangeSort(value as SortKey);
   };
@@ -94,10 +100,11 @@ export default function NoticeSearchResultHeader({
                 ref={wrapperRef}
                 className={cn(
                   "fixed inset-0 sm:inset-auto sm:absolute sm:top-12 sm:right-0 z-10 bg-white",
-                  "border border-gray-20 shadow-xl rounded-[0.625rem] overflow-hidden",
+                  "border border-gray-20 shadow-xl sm:rounded-[0.625rem] overflow-hidden",
                 )}
               >
                 <FilterDropdownContent
+                  refetch={refetch}
                   onClickApplyButton={clickFilterConfirmHandler}
                   onClose={toggleShowFilter}
                 />
diff --git a/src/hooks/useBreakpoint.ts b/src/hooks/useBreakpoint.ts
new file mode 100644
index 0000000..ac46c92
--- /dev/null
+++ b/src/hooks/useBreakpoint.ts
@@ -0,0 +1,23 @@
+import { useEffect, useState } from "react";
+
+import { debounce } from "@/utils/debounce";
+import { DeviceType, getDeviceType } from "@/utils/device";
+
+function useBreakpoint(): DeviceType {
+  const [device, setDevice] = useState<DeviceType>(() =>
+    getDeviceType(window.innerWidth),
+  );
+
+  useEffect(() => {
+    const handleResize = debounce(() => {
+      setDevice(getDeviceType(window.innerWidth));
+    }, 200);
+
+    window.addEventListener("resize", handleResize);
+    return () => window.removeEventListener("resize", handleResize);
+  }, []);
+
+  return device;
+}
+
+export default useBreakpoint;
diff --git a/src/hooks/useIntersection.ts b/src/hooks/useIntersection.ts
index c0d562a..1accc61 100644
--- a/src/hooks/useIntersection.ts
+++ b/src/hooks/useIntersection.ts
@@ -5,9 +5,12 @@ interface UseIntersectionParams {
   deps?: DependencyList;
 }
 
-const useIntersection = ({ callback, deps }: UseIntersectionParams) => {
+const useIntersection = <T extends HTMLElement>({
+  callback,
+  deps,
+}: UseIntersectionParams) => {
   const dependencies = deps ?? [];
-  const targetRef = useRef<HTMLLIElement>(null);
+  const targetRef = useRef<T>(null);
 
   useEffect(() => {
     const observer = new IntersectionObserver(callback);
diff --git a/src/hooks/useRemoveTopPageScroll.ts b/src/hooks/useRemoveTopPageScroll.ts
new file mode 100644
index 0000000..34b7cc7
--- /dev/null
+++ b/src/hooks/useRemoveTopPageScroll.ts
@@ -0,0 +1,28 @@
+import { useEffect } from "react";
+
+import useBreakpoint from "./useBreakpoint";
+
+import { DeviceType } from "@/utils/device";
+
+interface UseRemoveTopPageScrollParams {
+  condition: boolean;
+  observeDevices: DeviceType[];
+}
+
+function useRemoveTopPageScroll({
+  observeDevices,
+  condition,
+}: UseRemoveTopPageScrollParams) {
+  const device = useBreakpoint();
+
+  useEffect(() => {
+    const deviceCondition = observeDevices.includes(device);
+    if (condition && deviceCondition) {
+      document.body.classList.add("overflow-hidden");
+    } else {
+      document.body.classList.remove("overflow-hidden");
+    }
+  }, [device, condition, observeDevices]);
+}
+
+export default useRemoveTopPageScroll;
diff --git a/src/utils/debounce.ts b/src/utils/debounce.ts
new file mode 100644
index 0000000..8938d86
--- /dev/null
+++ b/src/utils/debounce.ts
@@ -0,0 +1,16 @@
+export function debounce<T extends (...args: unknown[]) => void>(
+  func: T,
+  delay: number,
+): (...args: Parameters<T>) => void {
+  let timeoutId: ReturnType<typeof setTimeout> | null = null;
+
+  return (...args: Parameters<T>) => {
+    if (timeoutId !== null) {
+      clearTimeout(timeoutId);
+    }
+
+    timeoutId = setTimeout(() => {
+      func(...args);
+    }, delay);
+  };
+}
diff --git a/src/utils/device.ts b/src/utils/device.ts
new file mode 100644
index 0000000..f5b7d46
--- /dev/null
+++ b/src/utils/device.ts
@@ -0,0 +1,28 @@
+export interface Breakpoints {
+  largeDesktop: number;
+  desktop: number;
+  laptop: number;
+  tablet: number;
+  mobile: number;
+}
+
+export type DeviceType = keyof Breakpoints;
+
+export const BREAKPOINT: Breakpoints = {
+  largeDesktop: 1280,
+  desktop: 1024,
+  laptop: 768,
+  tablet: 640,
+  mobile: 0,
+};
+
+export function getDeviceType(width: number): DeviceType {
+  const entries = Object.entries(BREAKPOINT) as [DeviceType, number][];
+  const sorted = entries.sort((a, b) => b[1] - a[1]);
+
+  for (const [type, minWidth] of sorted) {
+    if (width >= minWidth) return type;
+  }
+
+  return "mobile"; // fallback
+}