
Can someone fully explain this to me? I don't get any of it

Lemme try.
So the younger brother, that Scum, slept with that old man to get an acting role. The actor for that role has already been decided tho. So now the chairman of the company, that hot dude, is using the the video to threaten MC to tell Scum to give up the role.
Who gave the video to Hot Dude? Presumeably someone that want to fish in troubled water.
Hot Dude thought Scum is MC's lover and able to convince him. But in previous chap, MC already met Scum and Scum already rejected him like the scum that he actually is.
Now MC is trying to convince Hot Dude to delete the video. Because if he spread it, then he'll be enemy of that dead old man's people.
This is the creepiest read ever but I can't get enough