Might include spoilers I guess? If you're usually really bad at telling who the endgame ML is then uh...yeah, ignore this list xD You might not like it.
Can be various degrees of long, not just super long!
First two are officially licensed on webtoon! Make sure to support the author and artist there
Not included because there's no entry for it on bato: Remarried Empress (also on webtoon) [I already said that they can be various lengths that aren't just "short", and this one is included in that imo]
They're ordered from "really long" to "slightly longer than what we usually see"/"does this count as a mullet or a rat tail?"
Finished series are the ones from Who Made Me a Princess? and below!
For Arwin's (Miss Not-So Sidekick) hair: It's just the bangs that are long yes I know, but still technically counts!