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Detective Jeon Wonwoo's life takes a harrowing turn after a drunken night leads to an unexpected pregnancy with no memory of the father's identity except for his tattoo. Juggling the responsibilities of being a cop and a single father to his son, Wonwoo's world is further complicated when he is assigned to investigate the notorious Kim family, embroiled in illegal activities ranging from drug smuggling to sex trafficking.
Going undercover within the Kim family, Wonwoo encounters the enigmatic and feared eldest son, Kim Mingyu. Despite Mingyu's tough exterior, Wonwoo senses a connection, and their paths intertwine during a fateful drunken party. As the morning reveals their shared bed, Wonwoo recognizes a familiar tattoo on Mingyu's back, leading to the shocking realization that Mingyu is the father of his child.
Faced with the truth, Wonwoo withdraws from the undercover mission, prioritizing his son's safety over his career. However, Mingyu's discovery of Wonwoo's identity and their son's existence sparks a dangerous game of cat and mouse. Determined to protect his family, Mingyu captures Wonwoo and their son, seeking to forge a bond and keep them safe from external threats.
As tensions rise between law and crime, Wonwoo and Mingyu navigate an unexpected romance amidst the chaos. Their forbidden love blossoms as they grapple with their opposing worlds, torn between duty and desire. With news of Wonwoo's disappearance spreading, the line between peace and chaos blurs as they fight to protect their son and their burgeoning love.
