come and go without leaving a trace
It's a Chinese idiom, Pinyin is l á IQ ù w ú Z ō ng, which means you can't see when you come and go. To describe being extremely swift or secretive. From journey to the West.
Analysis of Idioms
Come without a shadow, go without a trace
The origin of Idioms
The eighty first chapter of Wu Chengen's journey to the West in Ming Dynasty: "with a golden cudgel that is not short but not long, you can come and go without a trace."
Idiom usage
It is not impermanent. How could he not have a branch and a leaf again? He would say that the monster has a green face and red hair. (Chapter 61 of three heroes and five righteousness by Shi Yukun in Qing Dynasty)
come and go without leaving a trace
solicit help from potential backers high and low - zuàn dòng mì féng
the disease for which no cure has been found - bù zhì zhī zhèng
a piece of work embodying one 's utmost effort - liáng gōng kǔ xīn