MTL - From Arms Dealer To King of War - Chapter 666 simulation exercise

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

After dying, you wake up and realize you've been reincarnated as a background character who is judged as human trash.The decision to change your destiny comes instantly.Discovering that your identity isn't as simple as you thought, you feel favored by the heavens when you manage to become a powerful character.Katase: You won't fool me. I'll expose you for the pervert you are.Murayama: ...Thank you for saving us.Issei: Motohama, what happened to you? How are you so powerful?Rias: If you join my peerage, I wouldn't mind being yours.Sona: You beat me in the game. That means you're now my fiancé.Yasaka: Honey, Kuno wants a little brother.Kaori Houjou: Shinji-kun, let's go on an adventure.Kaede Kazama: Shinji-kun, thank you for saving me from that ball.Rie Sawada: Shinji-kun, I'll wait for you. You'll be my future husband, fufufufu...Changing known history and taking it in a direction not even his eyes could perceive, he didn't stop no matter what. Not even the other world was safe from his clutches.Lexia Von Arselia: My hero, and my future husband...Shinji advances without stopping.“I, Shinji Motohama, swear here and now that I will reach the top of both worlds.”

Bathed in the love of her imperial family and her husband, Yun Shang was a spoiled princess and the envy of many at the Royal Court. Her life had been perfect right up till the moment when she realized that everything was just a sham, a ruse designed by the Empress to ruin Yun Shang. After enduring bitter treachery and being poisoned, Yun Shang died with a broken heart and an unfulfilled vow of vengeance. As if God was answering her final request, Yun Shang found herself reborn like an immortal phoenix. She was eight again, and all her memories from her previous life remained intact. The others, however, did not remember the events leading up to her death. Determined not to repeat her mistakes, Yun Shang planned to rain hellfire onto the treacherous, backstabbing villains for all the heart-wrenching pain they had once inflicted upon her. He was the handsome and smart prince of the Ning, who was revered as a battle-hardened general that knew no match in the world. He had thought he wouldn’t settle for anyone until she showed up. A seemingly innocent young princess and a gorgeous prince. Where would their relationship lead them?

- Description from Novelupdates

Ahn Seung-hyun, a college student who lived hiding his identity as a gay man. While on his way to meet an acquaintance he met through a gay dating app, he discovers that the acquaintance is a college classmate trying to out him.He tries to run away but gets into a traffic accident. Just when he thought he had died, he finds himself possessing ‘Han Seung-hyun’, the villainous character from the novel he was reading, and continues living that life.However, there’s a problem: ‘Han Seung-hyun’ is someone who has been given a life sentence with a time limit.Feeling wronged for a moment, Seung-hyun thinks, ‘Since I’m dead anyway, can’t I fulfill my dream of being a rich unemployed person for a little while?’ and resolves to do everything he wanted to do with his remaining life.Can’t he have s*x at least once before he dies? With that thought, Seung-hyun boldly goes to a gay bar to find a one-night stand partner, but ends up getting involved with the one person he absolutely shouldn’t have.“Ju-, Ju-, Ju Jae-young-ssi.”“Yes. I am Ju Jae-young.”What will happen to Seung-hyun’s terminal life after spending a night with Ju Jae-young, the sub-male lead in the novel who dislikes Seung-hyun?