Architecture 101

In front of Seung-min, a 35-year-old architect, unexpectedly appears Seo-yeon after 15 years. Seo-yeon asks Seung-min to design a house for her, unable to hide her surprise. Seung-min, who builds a house for Seo-yeon as his first project under his name, begins to revive memories of what might have been love as they work together to complete the house. As they do, new emotions start to build between them...