Responses
*SPOILER*
If you're talking about whether the Eastern King, Tenran, knew that "Asagi" did with someone else, then maybe, maybe not. They didn't address it after fixing the whole ordeal. It really shouldn't matter anyways because it wasn't really Asagi tbh. So, it's not cheating, imo, and I usually absolutely despise cheating. I think Asagi gets a pass for not dying out on Tenran.
Did the eastern king knew he had sex with another person?