Myungsoo and Sungyeol were once married but because of build up tension, misunderstandings, and arguements the couple ended in bitter divorce. The only single bond that connects them is their five year old son Myungsol. 

Sungyeol :

Age: 24

Sweet and gentle, Myungsol's umma. Once he was a person who had endless smiles, but due the bitter divorce he work part-time to take care of his son, while sharing him part-time with Myungsoo. Never got a chane to pursue a higher education because he married young and had a child. A very hardworking person but gets easily stressed because of his situation. 

Myungsoo:

Age: 27

Myungsol's appa, his personality is a bit aloof, unsociable, doesn't like to talk about his feelings. He really can't express himself well, but to Myungsol he is a great father. He works hard to send money to help raise Myungsol. Split his time with Sungyeol to raise Myungsoe, he usually see Myungsol on weekends where as on week days his son stays with his Ex. He works as a professional photographer but usually gets Wedding Photo gigs over other kind of work. 

Myungsol

Age: 5 1/2

Some say he is the carbon copy of his Appa. His habits are simliar to his father, but he has a brighter side than Myungsoo. Biggest wish is for his parents to get back together. Loves black, and photography like his father. He's a gentle and nice boy, but misbehaves when he senses potiential partners who tries to replace one of his parents. Often follows his dad on weekends to work to assist him.