I just read it's last chapter and the scene goes like this:
Mc & FMC are going on their first date and FMC was a shy type character and doesn't wanted to be in love or anything later but now she want to change and want to give her best in her upcoming date so she asks her classmate (Who is a cheerful girl and extrovert and really want to help the FMC)
She agrees to help her and also helps her with the outfit and what to do etc.
But she still worries about FMC and asks other guy(This is another side character with glasses and he is kinda serious type, focuses on studies more) to accompany her in following them (Mc & FMC)
They both together follow them and later on their way home train the glasses guy is watching the main couple from behind while the other girl is sleeping on his shoulder.
(ALSO THERE WAS ALSO A MOMENT WHERE THE GIRL ASKS THE GLASSES GUY IF HE HATES THE MC WHERE HE REPLIES NO HE DOESN'T)