Berserker; beautiful but emotionless because of past trauma when her mother committed suicide in front of her because she thought her father and Seoyoon were in an incestuous relationship, began to open up because of Lee Hyun, but Lee Hyun is a knuckle headed idiot who just think she's after his items.

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The Beautiful angel-like Seoyoon

It's implied that she has feelings for Lee Hyun but can't even express it