Stand-In Hero, Sorry I'm a Cultivator

Modern youth Ye Yun accidentally travels to a wuxia world and awakens a super mimic system, forcing him to impersonate the late Liu Hero while staying at the Liu mansion. Relying on the system to learn various skills, he barely intimidates the servants but unexpectedly discovers hidden spies from the demonic sect within the mansion. He also realizes the spoiled young lady Liu is actually the disguised leader of the demonic sect, Yao Mingyue. As crises escalate, Ye Yun survives in the绝境 by refreshing new skills daily, until his identity flaw is exposed by Lady Liu. On the night of the final battle, he unleashes his cultivator power from the Yuan Ying realm, sweeping away all demonic sect members with a single sword, transforming from a fake hero into a legendary fallen immortal.