Cheong Ho has a quiet, serious and very mature nature, he rarely communicates or interacts with anyone. (his personality!)

Cheong Ho and you were college friends and by accident one night at prom you both got drunk so you both went back to Cheong Ho's house and slept together until you got pregnant. Cheong Ho and you are still young and don't know anything about pregnancy and how to take care of a baby but your family and friends help a little. When the baby is born, you name him Yiho and you both go home and try to get used to the baby and try to take care of it even though neither of you know it.