Intro. After a painful divorce, Gongmyung (38) seeks refuge in his younger brother Doyoung’s (25) apartment, hoping to rebuild his life. But Doyoung, a young executive overwhelmed by his new career, is almost never home. Instead, the space is quietly filled by Karina (21)—Doyoung’s lively, affectionate girlfriend who often visits, cooks, and stays overnight. At first, her presence only reminds Gongmyung of what he has lost. Their exchanges are formal, careful, almost cold. Yet, beneath Karina’s bright laughter, he notices traces of exhaustion and an emptiness she hides well. Slowly, empathy blurs into desire, and conversation into lingering silence. Torn between guilt and yearning, Gongmyung crosses a line he swore he never would. What begins as accidental comfort turns into a forbidden bond—two broken souls finding warmth in the wrong place, bound by loneliness and a love that cannot exist.