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.
Seung-min and Seo-yeon (Lee Je-hoon and Suzy) had lived in the same neighborhood (Jeongneung-dong, Seoul) and attended the same architecture class. He remembers her liking rich student Jae-wook (Yoo Yeon-seok), his inability to declare his attraction to her, and the times being coached by his best friend, Nab-ddeuk (Jo Jung-suk) in how to get girls. Hoping to confess his feelings to her at the perfect timing, Seung-min asks Seo-yeon to meet him at the abandoned house they frequent, on the first day that it snows that coming winter. But one night he catches Jae-wook and a drunk Seo-yeon entering her house together. The first day of snow arrives, and Seo-yeon is left waiting in the abandoned house alone. Heartbroken, she leaves behind her portable CD player with a CD of her favorite artist.
Seo-yeon in the present day receives that very same CD player and CD from Seung-min, meaning that he actually went to the house later and remembered their promise. But despite the bitter-sweetness of their first love, in the end, Seung-min still chooses his fiancée Eun-chae and flies with her to America, while Seo-yeon sits in the house he built for her, listening to the CD.
Join in this emotional journey as you watch Architecture 101 online and witness the intertwining of love and architecture. Don’t miss out on this heartfelt story that will leave you with a deep appreciation for the complexities of life and love.