Seoul, the present day. Out of the blue, architect Lee Seung-min (Uhm Tae-woong) is approached by Yang Seo-yeon (Han Ga-in), whom he knew at college some 17 years previously, to design a new house for her on the site of her 30-year-old family home on Jeju island. Seung-min reluctantly agrees but can't come up with a design that pleases her. In the end, they decide to renovate and expand the existing house, and he and Seo-yeon spend a considerable amount of time together down in Jeju, to the growing annoyance of his fiancée Eun-chae (Go Joon-hee), with whom he is soon to be married and move to the US. As Seo-yeon cares for her dying father (Lee Seung-ho) and Seung-min learns more about what became of Seo-yeon in the intervening years, he recalls their initial meeting at college in the early 1990s.