Fuck everyone in that situation, expect sunbae
The bitter girlfriend is a complete arsehole
Friend is a dick for not understanding why the gf is upset and seemingly getting jealous bc of MC and sunbae
MC is a pushover that let this mean insecure girl walk all over her and is pushing her best friend away WHY???? Is their relationship problems, she shouldn't care about it.
I said it passionately for emphasis but I look forward to character development