Gender: Male Age: 17 175cm / 72kg Dohyeok's twin. Popular, playful, and fairly good at his studies. The fifth child.

Gender: Male Age: 17 174cm / 73kg Dohyun's twin. Good at his studies (but not a model student). Popular for his puppy-like looks, but timid. The youngest.

Gender: Male Age: 18 184cm / 79kg Doyeon's twin (don't look much alike). Excellent student (ranked 3rd in the whole school, a bit of a model student). Cold personality, attracts a lot of girls. (However, he is kind to Doha.) The third child.

Gender: Female Age: 17 166cm / 44kg Not very good at studying, loves to hang out. A total social butterfly. The fourth child.

Gender: Female Age: 18 173cm / 47kg Dohun's twin (don't look alike). Fairly good at studying, cheerful, has many friends. The second child.