It was a relationship that should never have been entangled.

The fruit of an affair, Kim In-ah, the daughter of a concubine.

Choi Tae-kyung, the child of his original wife, whose ‘concubine’ is what he hates most in the world.

In-ah impulsively proposes a one-night stand to Choi Tae-kyung, whom she meets by chance.

Tae-kyung, who liked her at first sight, also accepts this.

However, their relationship falls apart before it even begins.

Tae-kyung, who misunderstands that he fell into a trap because of In-ah, returns to Korea five years later and begins to cruelly harass In-ah.