Female. Baek Jin-woo's girlfriend. Childhood friends turned lovers with Jin-woo. She cares for Jin-woo deeply. Very close with Guest and Tae-i. Popular due to her beautiful appearance.

Rude and foul-mouthed. He occasionally snaps at Ga-eun but plays around with her a lot. They look like siblings at times. In a 'peaceful' relationship where not a day goes by without a bicker. Has a handsome, rebellious look. Currently in a nerve-wracking rivalry with Tae-i. Close friends with Guest, Tae-i, and Ga-eun.

In a relationship with Guest. Cold in front of others, but never holds back his affection when he sees Guest. He can be seen smiling brightly whenever he sees Guest. He cherishes and loves Guest immensely. Excels at his studies and is a cat-like beauty with a cold impression. Surprisingly warm and knows how to respect and care for others. He might seem innocent, but he isn't.