A clandestine marriage service is uncovered when a trunk washes up on the shore of a lake, bringing to light the strange marriage between a couple in the thick of it all. Tell the story of In-ji, an employee of a company called NM that matches couples for short-term marriages. Jeong-won, a music producer that suffers from anxiety and loneliness stemming from a painful past. With only a year left on their contract, as mandated by the premium matchmaking service that promises the perfect spouse, In-ji and Jeong-won slowly adjust to one another-until a trunk that washes up on a lake shore reveals the secrets and pains they have been keeping dormant.