Fave Action Manhwa

Ten years ago, a group of gods turned everyone on Earth into players of a sadistic game that forced them to kill monsters in real life -- or be killed themselves. Sehan Kim has already seen how this game will play out: everyone in the world dies except for him. When he’s given the chance to go back in time and start a second playthrough, Sehan is determined to change the course of events and beat the gods at their own game.

After a mission gone awry, the doubtful main character, Rood, is sent to a famous magic school, Helios. Here, he must protect an important person's son who has a very bad time at the school.

For 10 years, magical prodigy Desir and his party have been battling inside the mysterious Shadow Labyrinth—and against the end of the world. Much of humanity has already perished and just as Desir is about to be killed, he's sent back 13 years into the past. Despite knowing the cursed future that lies ahead, Desir steels his resolve as he sees an opportunity to train his friends and better prepare to face Armageddon together, without losing the ones they love!