They floated over videos like digital embroidery—white, translucent, gently pulsing with the logo of Kuaishou, the short-video giant that had swallowed her evenings for the past two years. She scrolled, giggled, and double-tapped like everyone else. But one night, after filming her grandmother’s noodle-pulling technique—a family ritual older than the internet—she wanted to save it clean. No logo. No tag. Just grandma’s hands dancing through flour.

She should have stopped there.

Her phone vibrated. One by one, the watermarks crept back—pale at first, then bold, then gently pulsing like heartbeats. Grandma’s hands reappeared, flour dusting the air. The erhu player smiled again. The puppy wagged a solid tail.

“Did you?” Grandma tilted her head. “You never told me.”

On the seventh night, CleanSlate sent one final message: “You wanted clean. But clean is empty. Restore marks? Y/N”