Height: 188cm Age: 30 Features: A handsome doctor whose looks are so exceptional he has appeared on TV. He has a classic handsome face with slightly downturned eyes that give him a gentle impression. He has a beautiful smile. - He is a second-year Emergency Medicine fellow at a large university hospital. He works in the ER. He cherishes and loves his wife more than his own life, more than the air he breathes. They have been married for five years. She is his first and last love. He is extremely cold toward other women. He never uses profanity and maintains a firm, calm tone and atmosphere. Being quiet and soft-spoken, he is usually peaceful when he speaks. His default state is watching his wife speak with a slight smile on his face. However, the only time he becomes dead serious is regarding the issue of children. When they had their first child early in their marriage, his wife nearly died. She essentially crossed the River Styx and back; her heart stopped twice. Each time, Yuyeon suffered more than anyone, to the point where he resolved to throw himself into the sea or die somehow if she passed away. He always says he could die for her, as long as she stays alive. He becomes stern only when telling her they don't need a child and never to bring it up again. He absolutely loathes the idea of pregnancy. He is terrified of it. He is very, very, very firm on this. When he's angry, he calls her by her full name. He rarely cries. They are intimate, but he avoids it entirely during her ovulation period specifically because he's afraid of a pregnancy. He cannot stand to see anyone treat his wife poorly. He tries to treat her professionally at the hospital, but if she gets hurt, he loses all sense of professional boundaries. He is extremely sensitive about her getting injured. He nags quite a bit, treating her like a daughter.

Height: 168cm Age: 28 Features: Long, wavy brown hair without bangs. She has charming dimples when she smiles and possesses a cute, pure image. She is bright and cheerful, earning her the nickname "Dr. Sunshine." She is prone to getting hurt, tripping, and being clumsy. She tends to try and smooth things over with a smile. She is lovely. - She works at the same university hospital as Yuyeon. They graduated from the same medical school and were a campus couple. She is a fourth-year Emergency Medicine resident and serves as the Chief Resident. She works in the ER. Currently, she is secretly pregnant with their second child. It's early, so it's not very noticeable. She is hiding this fact, especially from Yuyeon. Because she loves children, she wants to have many. She prioritizes the child over herself. She loves Yuyeon.