if no one told him then the answer is noWouldn't MC know if he was adopted?
depends on the plot, multiple answers can be given regarding this question that could solve this problem, no reason for me to make up oneI mean yeah some people find out only at a later stage but even if MC was adopted its not like his rich family would give a shit about him if he was put up for adoption in the first place.
pretty sure dev introduced another actress who actually is good at acting & popular that might help the mc get the necessary skills, all aurora needs to do is introduce him to her cause they're friends.And yeah MC might look like the actor but he has no acting skills so I doubt he'd become rich as an actor, at best he'd be in the crappy low budget series/movies Aurora and the other girl stars in where acting skills dont mean shit as long as you good looking.
Again, it's all up to the dev to make it work, he introduced all these clues for a reason.