OG 3rd prince

Yes, he knows

i think for his mom

I dont think so as the moms death is not on the same day as the original 3rd prince. And the 3rd prince told Plants 'As for me, I’ve lost my entire life' in ch 92. I think Plants understood that

Yes.

how did u know it was the day og 3rd prince dead?
i just though it was when MC decided to life as kallian. that's why his master told his dad bcs the 3rd prince found his own goal or something

Because the 1st prince said it was already a year ago everything about the 3rd prince changed and in a much earlier chapter there was a scene where the original 3rd prince said ‚goodbye‘ to the reincarnated prince. Maybe I interpreted it wrong

Said something like goodbye. Don’t remember it very well*