It's a carnivore vs herbivore world. It has a carnivore uke x herbivore seme. Uke is like a mafia and seme is an ex-military/ex-police I'm not sure though but he was kicked out because he helped a carnivore child. Afaik, uke forced seme to his fuck buddy.
could be this
https://www.mangago.me/read-manga/grasping_1/
Is there any moment where Yuri felt jealousy? Or he is just too martyr all throughout the story?
I'd like to reply here but I don't know how to spoiler (๑•ㅂ•)و✧
Spoil me bae
Yuri is just too calm, emotionally stable, and mature... Xinlu needed seven years to make Yuri love him the way he loves Yuri, and to finally get Yuri to admit that he gets jealous of the people Xinlu used to love, who Xinlu has been with, and that he wants Xinlu to only look at him and talk to him ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄