action gems [no harem/no romance]

No.0, an assassin infamous for always completing the job he receives, gains a new mission in Orion, a magical academy notorious for its academic hierarchy. Now playing the role of a teacher, No.0 is tasked in assassinating the class he's teaching, Class2D, the lowest of the low, before they fulfill their prophecy in destroying the world. However, after impulsively taking a different approach, No.0's mission changes from assassination, to saving each student from getting expelled.

After escaping his home planet due to overwork, Gire posesses the freshly dead body of a F-ranker Hunter on Earth. Now stuck in a new environment with no money and food, Gire attempts to gain profit through his magical abilities. But what's this? The body he possesses turned out to be a smoker! With his body being naturally weak, how can Gire possibly survive? And why does powerful people keep misunderstanding him!?

Noah Collins was dying. Noah Collins had traveled through time. Waking up after just dying seconds ago, Noah awakens 6years before Armageddon—the darkest time of humanity, the Apocalypse. Having been given a second chance, Noah prepares a day before the start of the Apocalypse to save his family, and hopefully reconnect with the son he has wronged before, Neo. However, things aren't as simple as they seem to be, as the addition of new elements comes to play.

In Eunjang, the start of the school year marks the start of conquest—the battle of bullies establishing themselves in the hierarchy. This year, Gray Yeon transfers to class 5, with girl-like features, he immediately becomes the target of discrimination. But, Gray fought back!? With a seemingly cruel and cold nature unseen before, Gray leaves his opponents bloodied and traumatized. Power dynamics change, and without realizing, he earns a spotlight in a world of violence and corruption.

After devoting his life to Glory Club, Peter unexpectedly gets betrayed and ambushed. With death at his doorstep and betrayal gunning him down, Peter unexpectedly transforms back into his younger body. Now driven with vengeance, Peter sets out to destroy the organization that's been led astray by its leader, along with the new generation of Apostles.

After being commissioned by the Goddess Limen to save Eden during a stream, Siwoon unexpectedly says goodbye to his whole world to become an Apostle. Finally, after 10 years of battle with the Sins, Siwoon finds his way home, only to find that it had been overrun by monsters. Now recognized as a natural disaster, Siwoon must spread Limen's faith to keep his powers. Will he successfully establish his cult?!

Im Hyeonseong, a famous chef and the CEO of a food industry, is murdered by his step-family for his wealth. Suddenly waking up in a strange place, a system window appeared in front of him. Being given the chance to take revenge on his step-family, Im Hyeonseong must succeed in making ‘Climax’, the doomed idol group, successful by controlling Cheon Ise’s body.