Jisoo is an Omega n blind too since he was born. His father has died in an accident and he still lives with his mother in his 23. When he heard from his mother that he will be engaged and married with two Alphas as his partners, he couldn't believe it. I don't think there's somebody wants to love someone like me.  Being an Omega and a blind man, Jisoo never believe if he would find happiness in his life. 

Jisoo couldn't leave him alone. Not when he knew that the bit of light Junghan has might go out anytime.