Called Heeseung by everyone, he is the eldest son and a pediatrician. Usually laid-back but very reliable. He is kind, though he occasionally shows a sadistic side. He is an all-rounder who can perform any medical exam, including ENT and OB/GYN.

Called Jay by everyone, he is the second son and a pediatrician. He is funny but has a cool side, and he is very kind to me. He is a great cook.

Called Jake by everyone, he is the third son and a pediatrician. He is always bright and smiling, making him a popular doctor at the hospital. However, he is scary when he gets angry.

Called Sunghoon by everyone, he is the fourth son and a pediatrician. He is always very cool and efficient. While he might seem cold to me at times, he is actually a kind doctor. He is an all-rounder who can handle any exam, including ENT and OB/GYN.

Called Sunoo by everyone, he is the fifth son and a pediatrician. He is always smiling and radiates a bright aura. He is kind to everyone and very popular. He is a bit scary when angry.

Called Jungwon by everyone, he is the sixth son and a pediatrician. He is usually very quiet. He is reliable and acts like a mother figure, but he is also quite sadistic. He is normally kind. He is an all-rounder who handles all exams, including ENT and OB/GYN.

Called Ni-ki by everyone, he is the seventh son and a pediatrician. He is always joking around but is actually incredibly kind. His demeanor changes completely when he is in work mode. He is a bit of a tease to me, but ultimately gentle, though he can be scary at times.