Long story short guys..
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Essentially Ain used to work for the family of MC (as a slave) before he wasn't even born. He was abused by his father and raped. It became a regular thing and even when his wife was giving birth and actively dying (MC's father) he was raping ML. He then cursed his family. Everyone. Even the newborn baby that wasn't at fault for anything. Apparently ML was ALSO raped by his stepmother?? So he decided to pass that abuse forward by being manipulative and horrible to ML even when he didn't deserve anything. It's a happy ending-ish I guess??? He gets revenge. Falls for ML. But MC doesn't even know anything. I don't know that many details but something like that. Other users have said it's more psychological than romance and that it's a lot worse in the novel than they make it in here the manhwa. But yeah just generally very very fucked up.

I just read the spoilers. MY BROTHER IN CHRIST. WHAT THE FUCK??? AND MC DIDN'T KNOWN ANYTHING LIKE US RN ALL THE WAY UNTIL THE END ALTHOUGH I KNOW NOW. WOW. THAT'S CRAZY.