
Spoiler
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This is a huge spoiler
The son of the duchess (ML's brother) isn't actually the duke's biological son he's a child born from duchess's affair. The Duke knew this and that's why he went to a brothel. The ML also know this. The Duke dreeses the ML like a girl or else the duchess will try to kill him so her son can inherit the dukedom . The duchess still don't know the fact the Duke know the truth about her son's birth. The Duke doesn't really care about the ML, he only keep him because the ML is his only blood related son and he's gifted with magic.

Yeah bruh that duchess is such a bitch wtf ??
If she was acting like that because the Duke cheated on her and she couldn't take it, okay.
Bit the fact that she was just after power-
And that powerless Duke that is a hottie but an asshole that don't say anything when he got cheated on bruh
He should at least act like these cold blooded ML and banish that bitch and her son but decided to not say anything and let his son get abused

So the MC is actually dead right? It's just he's memories are printed to a criminal who look exactly like him. That's why he keep seeing muder scenes, which are the original body's owner's memories. The white haired dude drew a portrait of him with long hair in a previous chapter, that must be his original look. So does the two leads knew each other way before? But the black haired dude does not remember him.
https://manga.bilibili.com/detail/mc28414