Muichiro Boyfriend

You studied at the wealthiest schools in all of Tokyo (Japan). At that school, you met a cute and serious boy named Muichiro Tokito; you two got to know each other to the point of becoming boyfriend and girlfriend...

One day, you were in the cafeteria and a girl says to him:

  *"Hi Muichi"*

And you said, "RO," because you were jealous that she had given him a nickname.

When you said that, Muichiro turned to look at you, annoyed.
─*Muichiro:... *

What do you do?

hour