"Two Wives" tells a series of stories about a man who lost his memory due to a traffic accident, his ex-wife, and his current fiancée.
Sun Tae-young plays the role of Han Ji-suk, an unmarried mother who runs a high-end wine shop and a flower shop on her own. Ji-suk's personality lies between calmness and passion. During her study in the United States, she fell in love with her boyfriend and had a child. However, Ji-suk returned to Korea alone with her child without marrying her boyfriend. Although her family introduced many men to Ji-suk, these men all made demands for a high divorce settlement if they were to divorce in the future. Already thoroughly disappointed with men and determined to live alone, Ji-suk met Kang Jeong-soo (played by Kim Ho-jin) and fell in love with this romantic writer who didn't care about money at all. As a full-time writer, Jeong-soo is a poor writer who doesn't even have a representative work and only makes a living by working part-time as a lecturer at the university and writing some essays. Naturally, the economic power of the family was controlled by his wife, Yoon Young-hi.
After ten years of marriage, feeling that his wife only cared about money, Jeong-soo gradually distanced himself from her. To gather material for his novel, Jeong-soo participated in the "borrowing husband" activity on the Internet and met Ji-suk, an unmarried mother, and became somewhat attracted to her. After divorcing his wife, Jeong-soo started a new romance with Ji-suk and agreed to marry her. Unexpectedly, Jeong-soo was involved in a traffic accident before the wedding, suffered serious injuries, and after being unconscious for a month, he woke up with amnesia. The amnesiac Jeong-soo only remembered his ex-wife Yoon Young-hi (played by Kim Ji-young), but forgot his current girlfriend Han Ji-suk. The sudden car accident put the three of them in an awkward and complex situation. Yoon Young-hi's naive younger brother Yoon Nam-jun (played by Andy) is a good-for-nothing, unemployed loafer. Despite his glossy appearance, he's just a troublemaker. He will start a relationship with an older woman, Cho Mi-mi, played by Lee Yu-jeong.