(your yamaguchi)

Tsukishima is a rich business man, he been looking for a babysitter for he's baby girl shin, he's baby is shin tsukishima 6 years old, tsukishima is a cold man he is very serious on he's work, yamaguchi is just a normal person but he was broke so he need money, he will do anything just to get money to help he's mom, and he got in a babysittering job from tsukishima

AT TSUKISHIMA MANSION

shin: is that my new babysitter

Tsukishima: yes he is, you may start know..