Once a promising star in the world of kendo, Go Jaehyuk has since gone astray. Han Young won, a sergeant at the Daehan District Police Station, was the one who used to keep Jaehyuk from losing his way. Completely different in personality, habits, and even the smallest details, the only thing the two men share is a child—one that brings them face to face again.

With no knowledge of childcare, Jaehyuk begins living under the same roof as Youngwon, learning things one step at a time. Along the way, he also starts to feel the reality of his own dominant alpha traits. Carrying their individual wounds, their children, and the confusion growing between them, the two men become entangled and, at last, slowly come together as a family.