Lee Han's existence had hit a standstill until he got a proposition that was both alluring and perilous: "Get close to the women residing in this building! Charm them, date them, blackmail them—whatever it takes." Lee Han is thrust into a dangerous game filled with secrets and allure, where every woman possesses a vulnerability that could alter his life entirely. "I need to begin with the married woman in unit 301, Han Soojin, and uncover her weakness fast!"