None of these are spoilers, just summaries, u can find all of this info in the summary or first few chapters. Master of Gu is good, it's one of the only good Chinese ones I found. It matches ALL of the criteria above and OMG I love it. Solo leveling is also amazing the character development is HUGE his appearance also becomes way cooler, but it might have romance in the future, but right now it does not as he is always alone. Kumon desu ga, Nani ka? Is cool because the mc is female and it's a refreshing isekai where she actually builds herself up from a weak spider to opness. She seems soft hearted in the beginning but I read the novel and NOT TRUEヾ(☆▽☆). Ranker who lives a second time is also cool, it's a revenge story about a guy avenging his twin bro who died. Cheating men must die is another female mc, and she doesn't fall in love with her capture targets, and obliterates them (similar to a Chinese novel I finished, don't pick up boyfriends from the trash bin, but the trash bin one is better. Also that novel is yaoi). The Hero seeks revenge shall exterminate with darkness is the most bloody in this entire list and I love it. Nidome no yuusha has a bit of romance I guess? But the focus is revenge. Thank you for reading this long thing, and if u wanna find more similar to these then I have a list called 'assassins, badasses, psychopath/sociopath, and revenge' or something like that (I'm not sure of the name and I can't check rn)
I really want him to do something really horrible to her (like manipulative shit) and then she forgives him and stays with him anyway and then when he finally starts liking her he realizes how stupid he'd been and then can't forgive himself idk just thinking about all the angst is getting me going (yes I'm fucked up, I know)