Infinite Rewind, I Will Be Cannon Fodder in the Demon King's Army

Lin En traveled to another world, but unexpectedly became the cannon fodder of the Demon King's army - a resurrected miscellaneous soldier. After obtaining the cheat [infinite rewind], death is a new beginning, and you can also gain previous experience, magic, special talents, etc. The war between the Demon King's army and the Silver Kingdom was about to begin. Lin En decided to grow slowly and first grow into the level of the Four Heavenly Kings under the Demon King. But the Demon King's Army didn't take the resurrected soldiers seriously at all. They just used black magic to summon new ones after they died. In the first flashback, Lin En was made into a servant by the teacher. Returning for the second time, he successfully defeated the teacher, but encountered a new surprise. Return for the third time. . . . . . The fourth return. . . . . . The fifth return. . . . . . I don't know how many times I went back, but Linn finally stood on the pile of corpses and became the new demon king, the most powerful undead spirit in the other world. "There are no cannon fodder dogs in the Demon King's Army... I don't treat me as a dog, I treat me as cannon fodder."