
I saw in the raws that there's a special chapter after season 1. It seems that they met when they were kids. Wooyoung was being bullied(?) by other kids bc of how cute he is and cha kyung joo saved him. They ended up falling asleep together and there's even a picture of it. (Wooyoung was 4 and cha kyung joo was 10)
That's my baby right there