MAY, a cross-border driver, relies on the predefined navigation of fixed cargo routes to navigate the divide between Hong Kong and Mainland China. When she accidentally swaps her map with LING, a bird conservationist, her rigid navigation is replaced by the unpredictable flight paths of migratory birds. This swap lures both women into a drift across the city, challenging their sense of control. Amidst a looming typhoon, they begin to transcend geography and instinct, discovering a freedom that exists off the map.