Swapping: Two Women(스와핑: 두 여자)

His wife has been acting strange. Oftentimes, she would go wherever, won't receive his calls, and won't reply when asked. The husband, Dong-seok, who suspects his wife's strange behavior, finds a business card in her car and visits it. He meets Hani there, the woman she saw in a video, and while he was immersed in her story, he experienced something strange.