Name of Cheat/Mod/Hack (credits: wendgames):
-MASSIVE DAMAGE/MOBS LOW ATTACK
Crystal Hearts (크리스탈하츠) MOD APK 1.6326 (Massive Damage/Mobs Low Attack)
1. Install MOD
Download the CACHE file/OBB file. They should be .zip or .rar files.
Extract the file to your sdcard.
Move the extracted folder to the location: /sdcard/Android/obb