diff --git a/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/config.h b/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/config.h
index 0bdb2653..6a5af678 100644
--- a/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/config.h
+++ b/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/config.h
@@ -1,6 +1,6 @@
 #define CHARYBDIS_CONFIG_SYNC
 #define POINTING_DEVICE_AUTO_MOUSE_ENABLE
 #define AUTO_MOUSE_DEFAULT_LAYER 10
-#define AUTO_MOUSE_TIME 650
-#define AUTO_MOUSE_DELAY TAPPING_TERM
+#define AUTO_MOUSE_TIME 300
+// #define AUTO_MOUSE_DELAY TAPPING_TERM
 #define CHARYBDIS_DRAGSCROLL_REVERSE_Y
diff --git a/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/keymap.c b/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/keymap.c
index b1fa9268..92651ee7 100644
--- a/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/keymap.c
+++ b/keyboards/bastardkb/charybdis/4x6/keymaps/oco9oco/keymap.c
@@ -114,7 +114,7 @@ void pointing_device_init_user(void) {
 }
 
 layer_state_t layer_state_set_user(layer_state_t state) {
-    // checks highest layer other than target layer
+// checks highest layer other than target layer
     switch(get_highest_layer(remove_auto_mouse_layer(state, true))) {
         case _MOUSE:
         case _NAV:
@@ -123,11 +123,23 @@ layer_state_t layer_state_set_user(layer_state_t state) {
             state = remove_auto_mouse_layer(state, false);
             set_auto_mouse_enable(false);
             break;
+
         default:
             set_auto_mouse_enable(true);
             break;
     }
     // recommend that any code that makes adjustment based on auto mouse layer state would go here
+
+    static bool mouse_layer_on = false;
+    bool now_on = layer_state_cmp(state, _ONEHAND);    
+    if (now_on && !mouse_layer_on) {
+        // 마우스 레이어 진입 시
+        tap_code(KC_LCTL);  // 예: 음소거 키 입력
+    } else if (!now_on && mouse_layer_on) {
+        // 마우스 레이어 탈출 시
+        tap_code(KC_LCTL);  // 예: 볼륨업 키 입력
+    } 
+    mouse_layer_on = now_on;
     return state;
 }
 
diff --git a/users/oco9oco/oco9oco.c b/users/oco9oco/oco9oco.c
index 0e033f8b..2de6e8b8 100644
--- a/users/oco9oco/oco9oco.c
+++ b/users/oco9oco/oco9oco.c
@@ -41,6 +41,7 @@ void appcmd(uint16_t keycode) {
 
 // process_record_user
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+
     switch (keycode) {
         case THUMB_L2:
         case THUMB_L3:
@@ -480,6 +481,7 @@ uint16_t get_tapping_term(uint16_t keycode, keyrecord_t *record) {
         // case SFTT_F:
         // case CTLT_D:
         //     return TAPPING_TERM ;
+        case SFTT_F:
         case LGUI_T(KC_Z):
             return TAPPING_TERM + 200;
         case SFTT_J:
@@ -513,10 +515,10 @@ bool get_hold_on_other_key_press(uint16_t keycode, keyrecord_t *record) {
         case THUMB_R1:
         case THUMB_R3:
         case SFT_CAPS:
-        //case SFTT_A:
+        case SFTT_A:
         // case SFTT_Z:
         // case GUIT_Z:
-        // case SFTT_F:
+        case SFTT_F:
         // case SFTT_J:
         // case ALTT_S:
         // case CTLT_D:
@@ -547,18 +549,25 @@ bool get_chordal_hold(uint16_t tap_hold_keycode, keyrecord_t* tap_hold_record,
 // Exceptionally allow some one-handed chords for hotkeys.
 switch (tap_hold_keycode) {
 case LSFT_T(KC_A):
-if (other_keycode == KC_W || other_keycode == KC_E || other_keycode == KC_R || other_keycode == KC_T) {
-return true;
-}
-break;
+    if (other_keycode == KC_W || other_keycode == KC_E || other_keycode == KC_R || other_keycode == KC_T) {
+    return true;
+    } else {return false;}
+    break;
 
 case LSFT_T(KC_F):
-if (other_keycode == KC_Q) {
-return true;
-}
-
-break;
+    if (other_keycode == KC_Q) {
+    return true;
+    } else {return false;}
+    break;
 
+case THUMB_L1:
+case THUMB_L2:
+case THUMB_L3:   
+case THUMB_R1:
+case THUMB_R2:
+case THUMB_R3:
+    return true;
+    break;
 }
 // Otherwise defer to the opposite hands rule.
 return get_chordal_hold_default(tap_hold_record, other_record);