Eighteen and Unstoppable

A 200-year-old ancestor with an 18-year-old face and huge hunger is tricked into visiting a rich junior. She heals his ruined meridians, crushes a rival clan, and wins awe with ancient cures and peerless power. At a feast, she kills a foe with a dinner knife, gains riches and seafood, then finds her disciple faked poverty, sparking a comic chase.