Great back story. Now no one can say that the MC didn't try. He tried to live a mediocre, normal, life once again...but he just couldn't. The MC is clearly destined for great things!
InDeathsEmbrace:That doesn't matter. What matters is that it fits in with the protagonist's characterisation - greedy, selfish, and egotistic. For his self-betterment, he is willing to sacrifice anything, and everything. And that's precisely what's so great.
The odd thing is didn't he say he cares about his family and then a second later kills his half-sister?? It's weird...Wouldnt it be better to groom her into a useful pawn for marriages etc. If mc is evil and lustful enough when she's an ***** he could turn her into a loyal concubine etc...