The Swapped Royals' Rise

A playboy Heir Apparent and a neglected princess have a Soul Swap! He, in her body, confronts the powerful, seizing palace authority and conquering the imperial city. She, in his body, gives up his debauchery, studies hard, restores his Family Prestige and the Marquis's Estate. A system provides cheats. A dual counterattack, satisfaction maxed out! Watch them swap lives, rise to power.