The Single Ex-Change

Dahye lists everything her ex-boyfriend left behind on a secondhand app, mostly to get it out of the flat. A man called Jinseok answers the ad, a single man in roughly the same position she is, with a marriage behind him he has not managed to put down. He comes to her place to trade and walks straight into the ex-boyfriend, who takes him for the other man and hits him. Jinseok helps her handle it, and that is how they meet. Having spent a long time trying and failing to get over his wife, he offers to coach Dahye through getting over the boyfriend, and passes on the methods he worked out for himself. Between the two of them the trading turns into something else and they spend the night together. Then his ex-wife comes back.