The extra is a fox eyed jester - Chapter 19: Devil heart

Every year, the Trial World summons chosen humans to face its brutal tests—deadly monsters, unpredictable trials, and the ever-approaching calamity that threatens to wipe out entire worlds. Only by defeating the Demon God can a minor world ascend and escape destruction.Leon Kael, born into a renowned family, awakens a Divine Talent on the day of his summoning—an ability that makes him stronger with every attack he delivers. Power isn't gifted freely in the Trial World. It's earned, carved out in blood, sweat, and unrelenting battle.Armed with this mysterious talent and the drive to protect everything he holds dear, Leon steps into the world of trials where every strike brings him closer to overwhelming strength. The path ahead is paved with bloodshed, glory, and the roar of defiance.If the gods must be attacked to survive—then let them bleed.

With unmatched talent, but a fate sealed by a terminal illness, Jeong Yeon-Shin challenges his destined death for a chance to live.Set in a realm where elves and dwarves coexist with martial artists, this is the story of Jeong Yeon-shin, a genius fighting to extend his life against all odds.

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

Yin BiYue has made the worst purchase ever. After transmigrating countless times into the bodies of canon fodder villains, he buys a ‘Fiend Halo’ from the Rebirth Company, supposedly the best aid for an up and coming final BOSS!

He’s ecstatic to finally get a villainous role where he won’t die after just a few lines, if any at all, and is raring to become the best opponent a protagonist will have… However, why was everyone looking at him with pitying eyes? Why was the protagonist rushing over to help him get out of his crimes? Most importantly, why was his ‘Fiend Halo’ just making things worse?!

Meanwhile, the intern salesperson at the Rebirth Company discovers that he might have accidentally sold a prototype White Lotus Halo to a certain villain…

- Description from Novelupdates