Im Suyi (Kor. 임수이) is a very famous celebrity student and a close friend of Shinwoo, Ikhan, and Yuna. She also becomes close to the Principal and the other members of Frankenstein's house.
Suyi is a very attractive young girl with dark turquoise hair and a piercing gaze when she chooses to use it. Because of her looks (and her fame), the kids try to avoid public places when they are with Suyi since strangers will stare at her, making all of them feel uncomfortable.
Even though she is popular, she prefers leading a normal life, and like a lot of other girls, she has a huge crush on Rai. She tries to do her best for her friends, even bringing Hansu with her to school in order to let her friends see him despite the fact that she didn't want to deal with him.
In her first appearance she is escorted by Hansu, another celebrity idol, to her school after having finished a concert. She gets a crush on Rai at her first glance. She later starts visiting Frankenstein's home to meet with Rai, Regis, and Seira. She gets in trouble when Shark and Hammer from the DA-5 kidnap the students as hostages. They are later saved by Rai. Afterwards, she becomes a regular visitor at Frankenstein's residence along with the other children.
Noticing that Rai has been looking weaker, the children decide to make something nice for him to eat. Shinwoo and Ik-Han volunteer to buy the ingredients and rush off after class. Suyi and Yuna wonder where they could've rushed off too, and whether they managed to buy the right ingredients.
Suyi is at Frankenstein's house with her friends, visiting Rai. Seira is cooking a meal for them, while Regis helps to serve the food. The children are talking about the story that was going around school earlier in the day, Suyi asks if Shinwoo and Ik-Han were responsible. Ik-Han denies this, however, Suyi disagrees. She tells them that since the kids at their school were attacked, by a gang looking for them, so they can't say they have nothing to do with it. Yuna agrees adding that some kids had their wallets and phones stolen. Shinwoo states that the guys said they'd return everything and not to worry. Suyi remembers the day in question and asks how they could cause trouble for other people, playing games at a PC room, and that when they showed up later than expected, they complained that it took forever to find the stuff they had to buy and had the girls massage their shoulders, because they were sore. Shinwoo and Ik-Han try to get Suyi to calm down and tell her it's no big deal. At this Suyi loses her temper. Shinwoo asks Rai for his thoughts, however, Rai remains silent. Shinwoo tries to defend himself saying that he hasn't really done anything wrong and that the two of them weren't even that late. Suyi yells they were two hours late. Shinwoo comments that Rai's face says that it's not such a big deal and why are they being harsh to their friends over nothing. Rai is confused by this and continues to remain silent. Suyi asks them what they're talking about and threatens them with a closed fist making the two jump.
Cadis Etrama di Raizel: Like all other girls, Suyi develops a huge crush on Rai at the very first sight. However, she treats him in almost the same manner, albeit a bit more politely than she treats her friends.
Frankenstein: At first, Suyi is surprised to see her friends hanging out in the Chairman's place so casually. But she soon gets used to it and often offers to clean up with Yuna. Frankenstein is the Chairman/Director of her school.
Han Shinwoo: Suyi is friends with Shinwoo. Despite being a celebrity, she behaves in a normal, friendly attitude and listens to all their requests, even troublesome ones.