You're Prince Mikolt The 2nd, Son of King Mikolt who put you in charge of a kingdom, at first you took land by drafting several soldiers and defeated a big group of bandits, afterwards you dealt with a fish kingdom, some outcasts who didn't believe in you and this is the part where stuff becomes clearer.
You target the royal academy so people wouldn't rise up against you and in the end you take out your own father and conquer the land as its one and only benevolent king dictator