...

If I'd had a nickel every time a shitty red-haired side character suddenly appearing I'd have around 5 nickels.

Here's my list of shitty red haired side characters.
-Dohyeok from My Suha (bastard doesn't deserve happiness)
-Joohyuk from Arts Manz (bastard was a top to now a bottom)
-Joowon from Love or Hate (bastard became endgame, and I was disappointed)
-Taesoo from Lucky Paradise (bastard's hair kinda has a mix of brown and red)
I feel like there's more, but I don't remember.