evil ukes...

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.