King of a Foreign Country

Before the king died, he sent his six children to various parts of the world, and assigned each of them a top-notch national advisor. Each national advisor had unparalleled unique abilities. Everyone knows that the six princes will face a fight for the throne when they reach adulthood... No one knows why the king does this. Among the six princes who were sent away, only the fourth prince encountered an ambush. He was forced to hide at the southern border of the country and spent twenty years in confusion. Twenty years later, the arrival of a murderous female mercenary changed his life and the fate of the entire kingdom...