Jessica Jung and Tiffany Hwang. What to talk about the relationship of the most popular girls from West High School? Well, the whole college knew their relationship was not good, due to Jessica and Taeyeon relationship. Jessica and Taeyeon were best childhood friends until Jessica discovered that her father was betraying her mother with Taeyeon's mother and that Taeyeon knew about it and hid from her. After that, the relationship between them changed completely