A woman attempting to reboot her life returns to Korea and becomes entangled with her childhood friend — with whom she shares a complicated history. Renowned young architect Choi Seung-hyo runs the atelier "In." Bae Seok-ryu, his childhood friend, rejoins his life after quitting her corporate job, Soon-to-be-wed Bae Seok-ryu returns to Korea and runs into her old friend Choi Seung-hyo. But she acts strangely around him, hiding a secret.
