Seo Soojin was eight years old when her parents sat her down and explained to her about soulmates and the red string tied around her finger, it was fate and she became thrilled with the idea of having someone out there made just for her. Unlike other people, her thread was long and extended as far as she couldn´t see, when she questioned her mother she explained to her that probably her soulmate didn´t live in Korea, but fate would one day bring them together

Soojin left taekwondo class and started training to be an idol, she spent tireless hours dancing and singing hoping that her group would debut, the string tied to her finger was forgotten for a while, after all she had more important things to worry. The group ended up not working and Soojin left the agency, she was sitting on a bench deciding what to do when she observed her string, she was still as long as before, she’d thought about the man on the other end, wondering what he’d would be like and she hoped he would support her idol career, she couldn’t wait to meet him

After some auditions Soojin joined Cube, she was more determined than ever to debut in a group, she was very shy so she hardly made any new friends at the agency. Soojin had just entered a dance class when one of the teachers warned that new foreign trainers had arrived and asked them to enter the room, some girls entered but Soojin didn't pay much attention to them until a girl with long black hair came in last, Soojin couldn't stop looking at her and the girl was also staring at her, the teacher tried to get the girl's attention but the only thing she did was to raise her hand causing the string that was tied in Soojin to be pulled, a woman? Soojin didn’t expect her soulmate to be a woman but the string connecting the two left no doubt, the girl name was Shuhua, she was born in Taiwan and she had just arrived in Korea, Shuhua barely spoke korean so at first it was difficult for them to understand each other but with the help of the cell phone translator and Yuqi, a Chinese trainer who spoke english, they got to know each other better

Shuhua and Soojin came to an agreement, they were soulmates but that didn't mean they should get into a relationship quickly, they decided to be friends first and get to know each other better before trying anything else, Soojin never thought she’d feel this truly comfortable with another person but Shuhua made her feel different, like home, the training and classes were exhausting, Shuhua was having a lot of language difficulties and Soojin spent cou