It's so frustrating but it's also understandable that the mc can't easily break away from that pink hair because she's been a lackey for years. She needs to regain her confidence and straighten things out.
Even then that pink haired girl was like "they r the worst type of parents they are always siding with their biological daughter, im'ma kill em all, show em hell... Blah blah blah" ╮( ̄▽ ̄)╭
Sangjinnnn stay stronggggg. I know Hansoo looks really good but hang in there