
Raised to be a killer. After being kidnapped as a small child and raised by the five men who abducted him, a teenage boy is now forced to join their life in crime.
Does Hwayi: A Monster Boy have end credit scenes?
No!
Hwayi: A Monster Boy does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of Hwayi: A Monster Boy, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Park Jin-woo
Detective Jang

Lee Jun-hyeok
Police Officer

Cho Jin-woong
Ki-tae

Min Young
Paju Hospital Nurse

Park Myung-shin
Assemblywoman Jeong

Woo Jung-kook
Blind Masseur

Park Yong-woo
Det. Chang-ho

Yoo Yeon-seok
Park Ji-won

Seo Young-hwa
Seon-ja

Lee Kyung-young
Lim Hyeong-taek

Moon Sung-keun
CEO Jeon

Im Ji-eun
Young-joo

Kim Young-min
Jung-min

Yeo Jin-goo
Hwa-yi

Son Jong-hak
Police Chief

Jang Hyun-sung
Jin-seong

Nam Ji-hyun
Yoo-kyung

Kim Sung-kyun
Dong-beom

Park Hae-jun
Beom-soo

Son Kang-gook
Police Officer

Yu Hyun-zun
Detective

Kim Yun-seok
Seok-tae

Han Joo-wan
CEO Jeon's Attendant

Lee You-mi
Yoo-kyung's Friend 1

Park Gyu-ri
Yoo-kyung's Friend 2

Han Chul-woo
Detective Kim

Min Bok-gi
Ex-prosecutor

Kim Lok-kyoung
Security Guard

Park Kyung-hye
Union Staff

Park Sung-jun
Student

Im So-mi
Cherry Tavern Young Lady

Im Hyeong-taek
Detective

Jang Seong-beom
Young Seok-tae
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Who is the charismatic leader of the five‑member crime organization that raises Hwa‑yi?
Read the complete plot summary of Hwayi: A Monster Boy, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
In a remote forest, a notorious five-member crime organization lives together on a deserted farm, bound by loyalty and fear rather than by law. The group is built around Seok-tae [Kim Yun-seok], the cold yet magnetic leader, with Ki-tae [Cho Jin-woong], a driving expert who speaks with a stammer, Jin-seong [Jang Hyun-sung], an ideal planner, Beom-soo [Park Hae-jun], a skilled gunslinger, and Dong-beom [Kim Sung-kyun], a disciplined martial artist. Their world is rocked when, as part of a blackmailing scheme that goes awry, an infant is left in their care. That baby grows into Hwa-yi, now a boy who lives as the son of these five fathers, and whose upbringing is anything but ordinary.
Hwa-yi, a child raised in close contact with crime, is taught by his fathers rather than sent to school. He absorbs a hard-won curriculum: driving, tactical planning, marksmanship, and martial arts. The household is an unusual school where every skill is learned through necessity and fear, and where affection is scarce but the bond between the boy and his guardians is intense. The boy named Hwa-yi, Yeo Jin-goo, grows into someone who can truly blend into their world, even as he secretly longs for a normal life that seems forever out of reach.
As the gang plots another crime, Hwa-yi is pulled into the plan for the first time. The operation spirals, and in the heat of the moment he shoots, his fingers shaking at first but then steadying with a sudden, almost possessed certainty. When he examines the image found on the man he has killed—a photo of a child—he realizes, with a shock that shards his sense of belonging, that the man is his real father. From that revelation, a burning resolve takes hold: Hwa-yi vows revenge on the fathers who raised him, using every devious skill they taught him to set his plan in motion.
Driven by vengeance, Hwa-yi begins by killing one of his five fathers. The others pursue him, but he manages to stay one step ahead. He lures the remaining men to Sungji Cement Factory, and a brutal clash unfolds as a rival gang arrives just before them. From a high vantage point, Hwa-yi begins to snip at the adversaries, sparing no one as the bloodletting erupts. When the dust settles, only Seok-tae and Hwa-yi remain standing.
Seok-tae heads to the hospital where Hwa-yi’s mother lies, and Hwa-yi follows in his wake. There, Seok-tae reveals the full story—from the orphanage to the kidnapping—laying bare the origins of the nightmare. The revelation is devastating, and Seok-tae ends up killing Hwa-yi’s mother in front of him. By the time Hwa-yi arrives at the hospital, it is too late to save her, and the boy must confront the man who raised him in a world of crime. Back at home, a tense confrontation with Seok-tae unfolds, with a detective dedicated to bringing the gang to account also present.
A violent standoff follows when Seok-tae destroys the detective, but Hwa-yi does not relent. In the final, brutal turn of events, Hwa-yi kills Seok-tae and steps away from the violence that defined his life for so long. The film closes on a stark, ruthless image: Hwa-yi, now a master of the skills taught him by his fathers, snipes the CEO of the rival gang, Moon Sung-keun, and then melts into the crowded streets, leaving his future—and his past—behind.

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