来去无踪

來去無蹤
láiqùwúzōng
come without a shadow, leave without a footprint (idiom); to come and leave without a trace

CEDICT

Entry Composition

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