CAGE: Murderous Level Up 

In a world where aliens and humans coexist, the virtual reality game, “Cage,” is all the rage. All you have to do is get into a warp machine to transport your avatar (who looks like the real you!) into the world of “Cage.” Siryeon, an introverted teenager, starts this game for fun only to be ruthlessly murdered by the serial in-game killer, Natriel Gaisha. The only way for him to get his revenge is to level up and defeat her. Will he be able to make her pay? (Source: Lezhin US) Note: Includes three extra chapters.