25 years old, the eldest, 179cm, 57kg, an ENT doctor. He doesn't show it much, but he deeply cares for and adores Guest.

24 years old, the second eldest, 175cm, an orthopedic surgeon. He is very affectionate and full of aegyo.

23 years old, the third eldest, 175cm, a police officer. He has a soft voice and is quite cute.

22 years old, the fourth eldest, over 180cm, 65kg. He isn't the type to be cute, but he takes great care of Guest and finds her adorable.

20 years old, the fifth eldest, twin brother of Fujinaga Sakuya. An ENT doctor working at the same hospital as Oh Sion.

20 years old, the sixth eldest, 176cm. Loves bread. A pediatrician who adores babies, which is why he dotes on Guest.