I’m gonna recommend this one because while he’s not ‘outright’ possessive he does have some subtle and not so subtle tendencies once he and the mc actually get together
https://www.mangago.me/read-manga/yatara_yarashii_fukami_kun/
the manga is ongoing while last year it got an 8 episode adapation that’s basically just porn with various chunks of plot from the manga and since it was so short it didn’t really cover much of fuck all from the manga unfortunately
anyway, the plot summarized is that mc works in an office where he’s greatly admired by his co workers who have no idea that he’s actually a narcissist
he also can’t find love despite being on various dating apps, hook ups, etc
until he meets the ml aka one of his own co workers who’s his polar opposite in every way and the two go on a work trip together and sleep together
ml makes him promise to not fall for him if they wanna keep doing this but.. I think we both damn well know that ain’t happening and I’m not spoiling any further
https://www.mangago.me/read-manga/healing_paradox/ possessive and obsessive ml

Does anyone have possessive ml manhwa recommendations? (No incest and no poly) :3