I remember reading and the ending being unsatisfactory as if it was cut showrt and wanting to reading the light novels because it wasnt enought but i couldnt find it, from what i remember there this child and hes mistreated because of his scars, he unfed and as a result malnourished, hes abuse bt family and servants alike, however a new servant is hired and be is assigned to the 'ugly prince'( with the drawing uts hard to tell hes ugly hes pretty gl) there he starts to take care of him ans teach him a better life style and they make a brothers pact, however after events the servant is taken to be punished and when returning to the price acts distant, they manage to get over that and the prince swears to take revenge and we find out hes a good strategist managing to tuen all the other princes on one another and learns to fend for himself as well as gets some new allies, he falls for the swrvant and shows his affection, i remember the servant not being to keen to respond cause for starters hes an eunuch ( hes got nothing down there, apparently thats rhe cost of being a male servant in the palace) and he doesnt like men obviously, however towards the ends from my memory they are telling their story to some kid ??? Idk
The Ugly Prince Manhua