They switched memories i mean everything that happen in mc memories was his brother memories thats why he hates him and wanted to make mc suffer like they made him
He's pretty much been brainwashed since being a kid to follow/coverup for jaehan. In the novel jaehan himself notes that he is surprised at how dedicated the secretary is despite the constant abuse.
I dont’t get it why does his brother hate him? Did yoon do something or what…
Same I was confused as well
They switched memories i mean everything that happen in mc memories was his brother memories thats why he hates him and wanted to make mc suffer like they made him