Hwayi: A Monster Boy tells the story of a young boy who is raised by five criminal fathers after being kidnapped as an infant. Hwa-yi, now 17 years old, has been trained by his "fathers" to be a skilled assassin. During a job, Hwa-yi discovers a shocking truth about his past, and his life is turned upside down. He vows revenge against his gangster fathers, using the devious skills he learned from them. The movie follows Hwa-yi's journey as he confronts his past and faces off against his former family, leading to a tragic and vengeful showdown. With a unique blend of action, crime, and drama, Hwayi: A Monster Boy keeps viewers on the edge of their seats until the very end.

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Some movies that have similar genres and were produced around the same time as Hwayi: A Monster Boy include Now You See Me 2, The Girl In the Spider's Web: A New Dragon Tattoo Story, Players, The Swindlers, Switch, La Rancherita.