What I remember is that Tiffany was a very famous person, her job was a public speaker(Not a 100% sure). She went on a lot of dates with guys to make sure she was "straight" for the public. She's dating Taeyeon, and she knows what Tiffany does, but she doesn't like it. Taeyeon wants to get married before she turns 30, and asks Tiffany when they can get married. Tiffany decides to push it further, like two more years, Taeyeon gets tired and leaves her. However, I think they get back together?