Spoilers ahead
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Ml is sus that mc is hiding smthg, basically he doesnt know anything abt mc and then he finds a chip under his lamp or some which im assuming is a voice recorder. Ml obviously gets mad and spikes mc's drink and ties him up and does the torture sex (dildo vibrator yada yada then actual fucking) to get mc to confess everything. Though i definitely hate it but i understand ml's frustration too. The method he chose isnt right though. I mightve missed skme key elements coz i read the raw but yeah ig this is probably what op is referring to as the recycled plot coz we've seen this many times.
When he finds the hidden chip? He gets pissed and disappointed. But from whatever i understood, next day he even gave mc a chance to confess on his own by indirectly asking but mc avoided and laughed it off. Ml had that grin on his face that characters make when they're really angry but is trying to not show. He had enough and made mc unconscious and did all that i mentioned above. Mind you I might just be getting it all wrong, i just tried to understand whatever i got from the drawn panels, i didnt translate the dialogues.
another "disappointed but not surprised" situation.. I didnt like the motherfcker from the beginning, and there he goes proving me right. I'm so sick of this type of character, and this genre is full of scum like him!!!! I genuinely do not see the fcking appeal!! these writers need to seek some originality and find other ways to develop their "plot".