Responses
SHADOW CROWN? I've read this not long time ago and it fits your description.
https://www.mangago.zone/read-manga/shadow_crown/
yesss!!!! tysm i was going crazy lol
guys i am pulling my hair out rn!!!!
so basically mc has black hair ml has long white hair. plot summary mc gets transmigrated to a different world and meets someone who looks excactlyyy like him. so hes like his good friend now and mcs friend is actually a prince and wants mc to fill in for him. mc swaps places with brother and ends up masquerading as a prince. mcs friend ends up dying so now he's stuck as a prince. thats about all i remember....
also, mls name was lion something and mcs name prolly started with an r.