Jang Won wants Tae Shik, a colleague, to change his personality. Jang Won warns Tae Shik of his mistrust in women before inviting him to his house. Moon Hee, Jang Won's wife, is greatly surprised when she sees Tae Shik for he is an ex-boyfriend. Jang Won's boss, Wu Seok, only focuses on work and neglects Hyun Suk, his wife. She is always lonely and full of dissatisfaction. Wu Seok sometimes calls Jang Won for advice. He learns from Jang Won that Tae Shik refuses to marry in hopes of winning back his first love. Jang Won goes to Wu Seok's apartment on business and succumbs to the Hyun Suk's seductions. Tae Shik meets with Jang Won and warns him about his wife. Moon Hee sits in anguish. Jang Won sits with bloodshot eyes, filled with jealousy. When will the wall of jealousy come down for them?