Ex-husband, Behave Yourself - Chapter 591

King of the silver screen, Fiennes Tang, passed away after years of fighting heart disease. He woke up to find himself in the body of an outdated idol male starlet. Since the heavens had given him a new opportunity, he decided to enjoy life to the fullest and reach the summit of the entertainment industry once again.

- Description from Novelupdates

High school student Mikoshiba Ryouma was summoned to a different world in the middle of a war. Sensing the malice from the one who summoned him (a summoner of the O’ltormea empire), he uses his martial arts to run away, killing important people of the empire during his escape. After the escape, he rescues two twin sisters from the hands of thieves. The sisters who can use magic, swear to serve him as subordinates. Thus, Ryouma begins his journey on the path of the supreme ruler.

You thought being reincarnated as an extra-side character was bad? Imagine being thrown into the body of a villain who is disowned by his own family and discarded by the author.