Seung Min, played by actor Lee Je-hoon, has always been passionate about architecture and dreams of becoming a famous architect. During his first year at the Academy of Architecture, he meets Seo Yeon, played by actress Bae Suzy, and the two quickly develop a close friendship. However, Seung Min secretly harbors feelings for Seo Yeon, who is more focused on pursuing her career as a musician.
Years pass and Seung Min becomes a successful architect, working on various projects and gaining recognition in the industry. One day, Seo Yeon reaches out to him and asks him to help rebuild her father's old house, which was destroyed by a fire. Seung Min eagerly accepts the project, hoping it will bring him closer to Seo Yeon.
As they work together on the renovation, Seung Min and Seo Yeon begin to reconnect and reminisce about their past. Flashbacks show glimpses of their youth and the feelings they had for each other. Despite still having strong feelings for Seo Yeon, Seung Min tries to keep things professional and focus on completing the project to the best of his ability.
As the renovation progresses, Seung Min starts to realize that the house holds a special place in Seo Yeon's heart, and that rebuilding it is not just about creating a structure, but also about preserving memories and history. The two grow closer as they work together and share personal stories and experiences.
The film explores themes of nostalgia, first love, and the value of preserving memories. It features stunning shots of architecture and design, as well as heartwarming performances by Lee Je-hoon and Bae Suzy. Architecture 101 is a must-watch for anyone who appreciates art, architecture, and romantic dramas.