It's a historical setting so it's not wrong BUT as MC wasn't born in that time he shouldn't be into the king or accepting any of this. It's disgusting of him to eventually fall in fall with the king with that kind of value. Is the king/seme going to marry another concubine after? Well as a king he's entitled to that regardless of the uke's feelings. He's allowed to love as many people as he wants...Uke can't even be mad at that. That's just the norm.
It's a historical setting so it's not wrong BUT as MC wasn't born in that time he shouldn't be into the king or accepting any of this. It's disgusting of him to eventually fall in fall with the king with that kind of value. Is the king/seme going to marry another concubine after? Well as a king he's entitled to that regardless of the uke's feelings. He's allowed to love as many people as he wants...Uke can't even be mad at that. That's just the norm.