Finally Mami is back. We never get to know what's up with her.
I went back to rereader her chapters.
So basically Mami said "There is someone else I like" and then they break up
Later, Mami's friend said, "so you haven't gotten over him yet huh", while she had a scary look
Mami then said she's in a relationship when she found out MC and FMC are dating
Maybe she was testing him but liked him?
Now 18 volumes we get almost nothing about her. This story keep introducing new characters that we don't care about