I Slept With His Best Friend(Dubbed)— Episode 18

Elite lawyer Xu Yan catches her fiancé, Gu Ze, cheating. Her move: she tucks a condom in a contract for Gu Ze's playboy best friend, Huo Wang, and invites him to a hotel. Revenge turns forbidden until Huo Wang bets everything on her, and Xu Yan learns the game was set ten years ago.