I forgot to bookmark when I'm reading it and yeah, I lost the title. Things I barely remember: (prolly not in the right sequence) - MC reincarnated as a prince. I'm not sure if it was 5th, 7th, or 12th prince (or maybe not one of these three? xD) - They have a stats system and MC is an S-class (?) water user then the King, MC's father, bestowed him a land known for its water resources. - I remember in the cover MC has heterochromia. One is blue(?) and one is red(?). - MC's older brother gave him a sword (demon sword?) - He's given the title of 'Wise Prince' - His stats increases depending on his subordinates. The stronger his subordinates, the higher his stats is. - The King assigned the Knight Commander as MC's swordsmanship teacher but commander refused bcs he has nothing to teach him anymore. - The King made the MC a judge to a swordsmanship competition (?)