adipocere

cunning personality, try Jinjin from "sweet desire the cold lord god who can tease coax and act coquettish"

he's basically the villain of the story beside ml lmafo https://www.mangago.zone/read-manga/paljae/

he's a general & politician so scheming kinda goes hand in hand with that. he's still a good-ish person ig? its just his circumstances (and his ego occasionally) force him to do not so morally good things
https://www.mangago.zone/read-manga/beauty_and_the_west_chamber/

he's suspected of scamming old ppl basically (whether he has or hasnt is spoilers lmao)
https://www.mangago.zone/read-manga/dead_or_alive/

he tries to act stoic but fails sometimes lmao and he's also lowkey kinda manipulative and kinda domestic abuser coded?? idk how to explain it but if u read it ull see
https://www.mangago.zone/read-manga/die_if_you_aren_t_the_virgin/

story centers on him becoming a better person. lowkey desperate but also stoic? but he also tries to act like a silly goofy guy?
https://www.mangago.zone/read-manga/one_room_ta/

no set top or bottom (cuz shounen ai) but the love interest is pretty cunning and tries to act stoic, also lowkey manipulative? he's a complex character lets leave it at that
https://www.mangago.zone/read-manga/sangyang_the_wanderer/

i havent finished reading this one but the bottom is genuinely an asshole lmao.
https://www.mangago.zone/read-manga/boss_bitch_baby/

Circle Trap
https://www.mangago.zone/read-manga/circle_trap/

someone already answered the same thing but "paljae" would fit your tastes perfectly. its also super good but i may also be very biased towards it

thank u so much everyone♡♡♡♡

https://www.mangago.zone/read-manga/doku_wo_kurawaba_sara_made/
mc is literally the definition of no remorse and nothing is impossible for revenge (more evil than "tyrant emperors")

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

mc is mad (as in sociopathic) scientist

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

mc is just a toxic lover tbh

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

mc is a criminal

all links are same.

shit really? wait lemme clarify...


https://www.mangago.zone/read-manga/doku_wo_kurawaba_sara_made/
mc is literally the definition of no remorse and nothing is impossible for revenge (more evil than "tyrant emperors")

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

mc is mad (as in sociopathic) scientist

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

mc is just a toxic lover tbh

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

mc is a criminal

Checkmate though it's probably one of the milder ones out there, I'm just biased.