Pick up the Sword of Tetanus and Bring Peace to the World

[No system] [Not brainless] [Unconventional time travel] [Darkening] Reaching the spiritual peak, stepping on the galaxy; slaying the demon emperor, going against time and space, who is behind all this? The protagonist's name is Han Sang, but he is not as handsome as his name. He accidentally traveled to a cave in a foreign continent? He took a tetanus sword and started his legendary journey. On the way, he encountered various unexpected things that constantly washed away his world view. Will he change his original intention? Unexpected plot unfolds, please support!