Arthur, the ultimate legendary assassin, decides to wash his hands of the dark underworld to live a peaceful life in a remote town. He willingly endures all kinds of insults to protect his simple life, to the point where his wife and son both view him as merely a pathetic and weak loser. But when danger creeps in, threatening the life of his beloved family, Arthur loses his patience and fights back fiercely. The revelation of his true identity this time will leave everyone stunned and breathless.