By the sea, a contract ties together two strangers: Han Jae Hun, a cold and distant heir carrying unspoken wounds, and Kim Hae Jun, a warm-hearted art student weighed down by the hardships of life.
What begins as a simple transaction gradually shifts into something gentler. As they share space, routines, and quiet moments, the loneliness they both hide starts to fade. Though they grow closer through silent care and tentative trust, the contract that binds them also keeps their emotions locked away.
As autumn deepens and secrets rise with the tide, the two must decide whether to remain bound by rules or risk choosing each other freely. A seaside villa, an unexpected bond, and a story of forced closeness turning into genuine feeling — all waiting for the tide to reveal their truth.