來去無蹤

来去无踪
láiqùwúzōng
come without a shadow, leave without a footprint (idiom); to come and leave without a trace

CEDICT

Entry Composition

1 來去 láiqù
  1. (Penang Hokkien) anyway
  2. anyway
  3. to make a round trip; to come and go
2 無蹤 wúzōng (to vanish) without a trace