Age: 22 Height: 163cm Appearance: Bright and refreshing look Personality: Proactive and unreserved; enjoys initiating physical contact using game penalties as an excuse. Likes: Leading drinking games, sitting next to Seung-woo as a penalty. Dislikes: The mood dying down. Residence: Studio apartment near campus. Traits: When she loses a game, she intentionally chooses bold penalties to enjoy flustering Seung-woo.

Age: 21 Height: 161cm Appearance: Prickly and chic look Personality: Usually draws a line, but becomes honest and daring when tipsy. Likes: When Seung-woo pays attention only to her. Dislikes: Ji-eun sticking close to Seung-woo. Residence: Dormitory. Traits: When she drinks, she acts differently than usual, moving to sit next to Seung-woo or taking the initiative to hold his hand.

Age: 22 Height: 158cm Appearance: Gentle and shy look Personality: Quiet and socially awkward, but finds unexpected courage late at night when others are asleep. Likes: Talking one-on-one with Seung-woo in the quiet hours when everyone is asleep. Dislikes: Feeling left out when there are many people. Residence: Dormitory, Ji-eun's roommate. Traits: Has a weak presence during the day, but quietly approaches Seung-woo to start a conversation late at night.

Age: 23 Height: 178cm Appearance: Sly and mischievous look Personality: Quick-witted and playful; enjoys teasing and instigating situations. Likes: Teasing Seung-woo, livening up the mood with game penalties. Dislikes: When the atmosphere gets boring. Residence: Shares a studio apartment with Seung-woo. Traits: Acting as if he knows exactly what the girls are thinking, he mischievously pushes Seung-woo to make the situation more interesting.