diff --git a/module/combat/level.py b/module/combat/level.py
index 24714e6b0..f12a71320 100644
--- a/module/combat/level.py
+++ b/module/combat/level.py
@@ -2,7 +2,7 @@ from module.base.base import ModuleBase
 from module.base.button import *
 from module.base.decorator import Config
 from module.logger import logger
-from module.ocr.ocr import Ocr
+from module.ocr.ocr import Digit
 
 LV_GRID_MAIN = ButtonGrid(origin=(58, 118), delta=(0, 100), button_shape=(46, 19), grid_shape=(1, 3))
 LV_GRID_VANGUARD = ButtonGrid(origin=(58, 420), delta=(0, 100), button_shape=(46, 19), grid_shape=(1, 3))
@@ -72,13 +72,7 @@ class Level(ModuleBase):
 
         return False
 
-class LevelOcr(Ocr):
-    # Ocr's default argument 'threshold=128' makes some digits too thin to be recognized.
-    # Use 'threshold=191' instead.
-    def __init__(self, buttons, lang='azur_lane', letter=COLOR_WHITE, threshold=191, alphabet='0123456789',
-                 name='LevelOcr'):
-        super().__init__(buttons, lang=lang, letter=letter, threshold=threshold, alphabet=alphabet, name=name)
-
+class LevelOcr(Digit):
     def pre_process(self, image):
         # Check the max value of red channel to find out whether the image is masked.
         # It would be no larger than COLOR_MASKED[0]=107 iff masked.
@@ -90,16 +84,20 @@ class LevelOcr(Ocr):
             scalar = np.mean(COLOR_WHITE) / np.mean(COLOR_MASKED)
             image = cv2.addWeighted(image, scalar, image, 0, 0)
 
-        image = super().pre_process(image)
+        # Deal with the blue background of chars before converting to greyscale.
+        # The background is semi-transparent. It turns (0, 0, 0) to (33, 65, 115), and (255, 255, 255)
+        # to (107, 138, 189). We use the middle point (70, 102, 152).
+        bg = (70, 102, 152)
+        # BT.601
+        luma_trans = (0.299, 0.587, 0.114)
+        luma_bg = np.dot(bg, luma_trans)
+        image = cv2.subtract(image, (*bg, 0)).dot(luma_trans).round().astype(np.uint8)
+        image = cv2.subtract(255, cv2.multiply(image, 255 / (255 - luma_bg)))
         # Find 'L' to strip 'LV.'.
         # Ruturn an empty image if 'L' is not found.
         letter_l = np.nonzero(image[2:15, :].max(axis=0) < 127)[0]
         if len(letter_l):
-            return image[:, letter_l[0] + 17:]
-        else:
-            return np.array([[255]], dtype=np.uint8)
-
-    def after_process(self, result):
-        result = super().after_process(result)
-
-        return int(result) if result else -1
+            first_digit = letter_l[0] + 17
+            if first_digit + 3 < LV_GRID_MAIN.button_shape[0]:
+                return image[:, first_digit:]
+        return np.array([[255]], dtype=np.uint8)
diff --git a/module/reward/meowfficer.py b/module/reward/meowfficer.py
index e8c311ea9..3f20938c1 100644
--- a/module/reward/meowfficer.py
+++ b/module/reward/meowfficer.py
@@ -1,3 +1,4 @@
+from module.base.timer import Timer
 from module.combat.assets import GET_ITEMS_1
 from module.logger import logger
 from module.ocr.ocr import Digit, DigitCounter
@@ -48,33 +49,34 @@ class RewardMeowfficer(UI):
                              next_button=MEOWFFICER_BUY_NEXT, skip_first_screenshot=True)
         return True
 
-    def meow_confirm(self, skip_first_screenshot=True):
+    def meow_confirm(self):
         """
         Pages:
             in: MEOWFFICER_BUY
             out: page_meowfficer
         """
-        executed = False
-        while 1:
-            if skip_first_screenshot:
-                skip_first_screenshot = False
-            else:
-                self.device.screenshot()
+        # Here uses a simple click, to avoid clicking MEOWFFICER_BUY multiple times.
+        # Retry logic is in meow_buy()
+        self.device.click(MEOWFFICER_BUY)
+
+        confirm_timer = Timer(1, count=2).start()
+        while 1:
+            self.device.screenshot()
 
-            if self.appear_then_click(MEOWFFICER_BUY,  interval=5):
-                continue
             if self.appear_then_click(MEOWFFICER_BUY_CONFIRM, interval=5):
                 continue
             if self.appear_then_click(MEOWFFICER_BUY_SKIP, interval=5):
                 continue
             if self.appear(GET_ITEMS_1):
                 self.device.click(MEOWFFICER_BUY_SKIP)
-                executed = True
                 continue
 
             # End
-            if executed and self.appear(MEOWFFICER_BUY):
-                break
+            if self.appear(MEOWFFICER_BUY):
+                if confirm_timer.reached():
+                    break
+            else:
+                confirm_timer.reset()
 
         self.ui_click(MEOWFFICER_GOTO_DORM, check_button=MEOWFFICER_BUY_ENTER, appear_button=MEOWFFICER_BUY, offset=None)
 
@@ -85,9 +87,16 @@ class RewardMeowfficer(UI):
             out: page_main
         """
         self.ui_ensure(page_meowfficer)
-        if self.meow_choose(count=self.config.BUY_MEOWFFICER):
-            self.meow_confirm()
+        for _ in range(3):
+            if self.meow_choose(count=self.config.BUY_MEOWFFICER):
+                self.meow_confirm()
+            else:
+                self.ui_goto_main()
+                return True
+
+        logger.warning('Too many trial in meowfficer buy, stopped.')
         self.ui_goto_main()
+        return False
 
     def handle_meowfficer(self):
         """