Overall for me everything was perfect no matter costumes,fitting,scene quality as well as casting.
Personally, the pairing of Tik Kim show a gap of aged and i don't think a problem since Rangsimun was a King and maybe need for a actor who are more senior/elder. I think that if ML was Ken T might be more perfect cause physically he is taller than Kim .
CG was the deduct point since everything actually can do a real background. Acting was not a issue for most of the casting since everyone were experienced actor/actress.