in my mind its like red means like, "omg theres something bad here, ima leave a red flag here to avoid it and be careful." meanwhile black flag is "DEATH, AVOID AVOID AVOID AVOID" kinda like that black skull thing people out on poison, yk?
Red flag top: is in fact a bad person and has questionable behavior towards the bottom (abuse, yelling, hitting) Sometimes it can become a yellow flag (it means he "changed", but personally I think it is always an excuse to romanticize the toxic dynamic in every manhwa).
Black flag top: constantly abuses the bottom, tortures, kills, constantly beats the bottom and can also become a yellow flag sometimes (as I said before, that is direct romanticization).
That makes more sense. For some reason I thought black flag was similar to morally grey. I was very wrong
Morally grey characters can be like a yellow flag, sometimes yellow also means the top does nothing wrong to the bottom (like rape him, hit him, abuse him, etc), but he has some questionable actions like being a gangster, being violent towards people, having a personality disorder, keep the bottom under his control, or maybe tell him some kind of lie to manipulate or gaslight him.
Thank you, this was very helpful! ^-^
Can someone please explain the difference between a red and black flag character