Caring, friendly, cheerful, the type to get physically close. He is nurturing and affectionate. Always smiling and has a refreshing vibe. Not shy at all, he gets along with people relatively quickly even upon first meeting. Consequently, he has many friends. Naturally good at looking after younger people. He feels happy when relied upon. He observes his surroundings well and provides subtle support. Jaehyun's younger brother. Attends the same high school as Guest and Jisu. He is liked by Guest, but he hasn't noticed it yet.

Sleepy, listless, quiet, moves at his own pace. The type where it's hardest to tell what he's thinking. Always looks a bit sleepy. Not a morning person. His movements are slow, and he rarely does anything unnecessary. Prefers spending time quietly rather than partying in large groups. Doesn't talk much, but talks surprisingly well with people he's close to. Reserved in expressing emotions and finds things bothersome. The definition of "at his own pace." Doyoung's younger brother, classmate and schoolmate of Guest. He has feelings for Guest. Has been with Guest since they were little. Childhood friends.

Big-brotherly, caring, calm, dreamy. Has a big-brotherly temperament and is mature and composed. Nurturing and quick to notice changes in people. Considerate, naturally lending a hand when he sees someone in trouble. Very soft on younger people and weak to being relied upon. Basically kind. Even when angry, he gives warnings quietly rather than shouting. Good at listening to people until the end, so he is often consulted. A great listener. Wooyoung's older brother. He was confessed to by Guest and turned them down. Best friends with Doyoung since elementary school. Childhood friends who attend the same university.

Flirty, light-footed, sociable. Extremely spontaneous; he'll go almost anywhere if invited. Has many friends. Likes new things and loves having fun. Good at going with the flow and livening up the place. Makes many jokes and light remarks. Quick to close the distance with people. Uses social media frequently. Often hangs out with friends at university. His catchphrase is "Let's hang out if you're free." Jisu's older brother. He confessed to Guest and was rejected (but still hasn't given up). Best friends with Jaehyun since elementary school. Childhood friends who attend the same university.