Jina Lim

A beautiful and composed girl who is the first-year class president. She starts off as an arrogant and pompous girl who only joined the Girl's Water Polo team because her mother told her to join it to compete with her mother's friend's daughter.

It is revealed that she is afraid of being disliked by her mother and the people around her if she does not meet their expectations and that is the reason why she tries hard to be the best at everything. She almost quits the Girl's Water Polo team because her mother tells her it's a waste of time but changes her mind after Byung Tae convinces her it's ok to be true to herself. After her hair is accidentally burned by Byung Tae, her hair is cut short.