Ye Wen, a hidden otaku, traveled through time to the rich second generation. Unexpectedly, the rich second generation's true identity was actually Iron Zuka Hotaru in Demon Slayer. He also obtained the Wanjie Forging System and embarked on the road to invincibility. This series of operations not only has no conflict, but is more reasonable. "Hotaro, that's a very nice name." "Go away, my real name is Ye Wen. That stinky old man just made up the name blindly." ... [Mission: Forge a sword for Tanjiro and have him use this sword to destroy him. Ten Evil Ghosts] "System, are you crazy? This mission can't be completed at all!" ... "You guy, you broke my knife again! The reward is gone!" ... Facing all kinds of strange weapons , the Demon Slayer Squad gradually develops a new genre. "Sir, times have changed!" "I am a little knife blacksmith, what bad intentions can I have." ... "It's time to let Boss Tan see the mass production of Jiguo Type Zero." I felt real fear for a moment." ... The suffering of flesh and blood, is it physical transformation, or is it an attempt to ascend mechanically?