Sinopsis: Nam-yeong promises to marry his first love, Yoon-ji, but faces opposition from her family. Instead, Yoon-ji marries Seon-woo, and Nam-yeong has a hard time forgetting her and ends up sleeping with Eun-jeong while he is drunk. In the end, Nam-yeong has no choice but to marry Eun-jeong. After much thought, Nam-yeong proposes to Seon-woo that they exchange wives. However, Nam-yeong, who is reunited with Yoon-ji after many twists and turns, makes her suffer due to his excessive paranoia.