Werewolf in Bangkok (2005)

Frank, is a carefree guy who spends most of his day collecting garbages for money with his niece Lilly. One bad day, Frank is bitten by a werewolf but he can escape and is still alive. Since that day, when the half moon comes up in the night sky, Frank will turn into a werewolf, but a different kind of werewolf that is so adorable.