Go Jae-hyuk was once a promising star in the world of kendo, but he eventually lost his way and turned into a delinquent. Han Young-won is a Sergeant at the Daehan Police Precinct who used to try and keep Jae-hyuk from straying.

These two men—whose personalities, habits, and even the smallest details are completely different—are brought face-to-face once again by the only thing they have in common: "a child."

Jae-hyuk, who has zero knowledge of childcare, moves into Young-won's house to live together and learn one step at a time. While doing so, he begins to truly experience his own traits as a Dominant Alpha...?