In-young is a housewife whose conventional life consists of spending time in a café. At the café, she meets Hee-soo, a carpenter, who suggests In-young that they become "coffee mates" - friends who only meet at the café and no contact via phone calls and message texts. As the meetings become more frequent, In-young and Hee-soo begin sharing their daily routines and personal secrets. Soon they find themselves having grown feelings for each other.