Doomsday: Invincible, Starting by Pretending to Be Mentally Ill!

[Apocalypse + psychopath + ruthless killer + survival against death + play the pig to eat the tiger + one heroine + good-for-nothing from the start + invincible] Do not read if you are a bleeding heart... Su Mu transmigrates into a parallel world where the apocalypse has arrived. After being reborn seven times in the same place, he decisively rejects a goddess's advances and pretends to be mentally ill to escape the scene. After awakening his System, Su Mu is determined to flee the infected zone. But when various factions arrive, he also discovers the truth of what is going on. With the System at his side, he kills zombies, battles monsters, picks up girls, and throws his teammates under the bus along the way. An invincible Zombie King? Sorry, first I'll torture him to death... Divine weapons belonging to the various factions? Mine, mine, they're all mine... A mutated fire-breathing dragon? Come on, let's see whose flames burn hotter...