In the small seaside town of Shinsu-eup, where the villagers closely monitor each other's every move, Yoon Bom is a figure who carries a question mark. Speculation abounds as to how Yoon Bom, once a successful teacher in Seoul, ended up in this town... But one figure boasts an overwhelming presence that instantly steals all their attention: Seon Jae-gyu, the townspeople's number one target of vigilance. When Bom enters his radar, her monotonous daily life begins to unravel!

There's something familiar about Jae Gyu's actions, though Bom can't quite figure out why. Meanwhile, Se Jin disappears, frustrated from always coming in second because of Han Gyeol. Bom and Jae Gyu head to Seoul to find her. At a critical moment, Jae Gyu's sudden appearance flips a switch in Bom's memory.