By black flag, you mean seme who is a total trainwreck nightmare right?
If so, https://www.mangago.zone/read-manga/the_heart_of_the_lotus/
Wow. Just from his looks in the cover he looks like a black flag, and not in a good way
He's a complete fucking psycho ╮(￣▽￣)╭
HOIST THAT FLAG HIGH
I’m a degenerate simp, so, as long as you look hot, every black flag is a green flag for me, but I’m sorry, his looks ain’t it for me I love deranged psycho’s but not when they look like they’ve been doing drugs for 2 centuries I’m sorry ;;
(This is also based off just the cover photo so idk lol XD)
(Also when I say any black flag is green flag, the only ones I don’t condone is when ml lets other guys r* the mc… cause that’s somehow an actual thing in “romance” stories
A good BL manhwa WITH GOOD art also top black flags
⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄