The Earth After Rebirth - Chapter 4: Graduation

Arnold never thought his gaming skills would land him in a romance novel—as a doomed side character, no less. To survive, he hijacks the heroine's “system,” bending the story to his will. But when he dodges a deadly duel, he catches the eye of the heroine, Lara, his own step sister—and her love is a dangerous game. Arnold must outwit the plot and his step sister who's not afraid to kill for love. In this LitRPG romance gone wrong, survival isn't just about beating the system—it's about escaping the heart of a yandere.

It all began with a poor orphan who would work every day for long hours to pay for his Aunt's medical bills.When his life begins to fall apart and he is homeless sleeping in an alleyway he hears a robotic voice.{Do you wish to integrate with the Dungeon System}“Yes” he answers, without much to lose.And from then his life had never been the same.He was taken into a dungeon each night to hunt and he began to realise just how little he really knew about the world that was much wider than he thought.

The world had started doomsday, and I struggled for a year, before I died under an enchanted beast’s claw. Heaven has given me another chance, back a day before the end happen. Will I be able to change my fate, and that of my loved ones? Now, I will start my journey on becoming the strongest on the planet that the Gods have changed into a game world.

- Description from Novelupdates

This book is about Jay (ceo of Mariano Enterprises) and Keifer (ceo of Watson Enterprises) falling in love. Ofc Jayfer is the endgame :)