Psychological mangas

https://www.mangago.zone/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/

It’s tagged with romance, but like it’s not full on romance, it’s just a *spoiler I guess* clingy ML who’s one-sidely crushing, but the psychological part is really really good:
https://www.mangago.zone/read-manga/my_student_can_t_be_a_psychopath/