Bae Seok Ryu, who always used to take the top spot in exams and has never experienced failure since childhood, is someone with innate passion and overflowing energy. Despite entering a global corporation, she ended up resigning from her project manager position following a certain incident. Choi Seung Hyo is Seok Ryu's 'Mom's Friend's Son.' He is the most prominent young architect in the current South Korean architectural scene. They have known each other since they were four years old and were encouraged by their mothers to become bathhouse partners, sharing banana milk in the women's bathhouse.