Taesoo's lil bro is soo cute T_T I want a story with him

I thought it was a girl

Same , I think it's his sis , correct me if I am wrong

Taesoo has a little brother and sister. But if you're talking about recent chapters then it's probably his sister.

Oh blimey, I had some doubts whether it was a he or a she, but hopee it was he