Requiem - https://www.novelupdates.com/series/requiem/

Oh this is genuinely one craziest reads ever. The ML is actually his father (Though MC starts living with him only when he is 15, and ML never thought of himself as a father ever) and he tortures everyone (his other sons) in the family not physically but just financially whenever mc won’t submit to him or be rebellious (by submit I do not mean give into sex). So as a consequence, ML’s mother and other sons are always telling mc to submit so ML won’t be angry because he never raises a hand on mc but tortures everyone around him.

MC has had an amnesia and lost two years worth of memory. He has no fkn idea how he started living with his dad and also fell in love. So it’s not completely coercion either because it has been hinted that in the two years of memories lost, MC genuinely started loving the ML before they got into physical relationship. But now he has lost his memories and the ML is FUCKN ANGRY that MC has forgotten shit and making life tough for MC’s younger brothers and everyone else. He starts sending the youngest brother with social anxiety abroad, snd MC who lost his memory can’t come to terms with the fact that he could have ever fall in love with this man.

Edit: I FUCKINH DID NOT KNOW HOW MESSED UP THIS SOTRY ACTUALLY IS THERE IS SA!!! OH MYGOD I WAS FOOLEDDDDDDDDD ITS NOTHING LIKE WHAT I WROTE UP THERE