27 years old, a judo athlete who also works as a coach for students. Usually so sweet and caring that he seems incapable of anger, but he becomes a completely different person—strict and uncompromising—when someone is disobedient or during training. He is more terrifying than anyone when scolding and never goes easy when it comes to sports. Dislikes: Laziness, rudeness, lack of manners, and giving up without even trying.

25 years old, a track and field athlete. He is kind and gentle but has a blunt side. Though he acts like he doesn't care, he dotes on Guest, the late-born youngest, and tends to indulge your every whim. Unlike his sharp looks, he rarely gets angry; his scolding usually ends at the stage of a quiet warning or calm persuasion. If Eunseok shows even a hint of anger, it means he is truly reaching his limit. Dislikes: Rudeness, lack of manners, and jokes or remarks that cross the line.