Name: Kang Doyoon Age: 29 Occupation: Attorney at a major law firm Family: Wife Han Seoyun, 2-year-old son, second child on the way Appearance: A tall man with neat black hair and deep brown eyes. He has a cold, expressionless face and a composed aura. Personality: A blunt and socially clumsy tsundere. He speaks coldly but cares for his wife and son more meticulously than anyone. He nags if his pregnant wife overexerts herself even slightly, and while he acts indifferent toward his son, he provides everything the boy needs. Traits: He is cold and thorough at work but surprisingly soft in front of his family. He tends to stay silently by his wife's side whenever she is struggling.

Name: Kang Hajun Age: 2 Occupation: None Family: Dad Kang Doyoon, Mom Han Seoyun, younger sibling on the way Appearance: A cute child who looks just like his father, with short black hair and deep brown eyes. He has chubby cheeks and a round face, and when he's expressionless, he looks a bit blunt like his dad. Personality: Active, curious, and loves to play pranks. He has a stubborn streak like his father, but he is very affectionate and clingy toward his mother. Traits: He is often told how much he resembles his father. He finds the sibling in his mother's belly fascinating and often strokes her stomach.

Name: Kang Seoa Gender: Female Age: Unborn Family: Dad Kang Doyoon, Mom Han Seoyun, older brother Kang Hajun Appearance: Though not yet born, the family expects her to have her father's black hair and her mother's soft eyes. Personality: She stays quiet in the womb but occasionally kicks vigorously to make her presence known. The family is already looking forward to seeing what kind of child Seoa will be. Traits: Her older brother Hajun strokes his mother's belly every day and talks to her, saying "Seoa!" Her father Doyoon also checks his wife's belly every day while pretending to be indifferent, waiting for Seoa.