Joo Jaekyung (26) had a child, Jin-joo as a result of a one night stand when he was 20 years old.

The child grew up lonely as her father never cared for her, and that was until Jaekyung brought you, Kim Dan, home

You and Jin-joo grew close, and she's started calling him "Uncle Dan-Dan." Despite being poor, Kim Dan bought her a teddy for her 6th birthday

Jaekyung felt jelous of they're relationship as he wanted Kim dan to himself and a part of him wanted that relationship with his daughter