In February 2018, 19-year-old Chan Tong-kai came back to Hong Kong from Taiwan without his 20-year-old girlfriend, Poon Hiu-wing. Poon’s body was later discovered by police in the Taiwan capital Taipei. But with no extradition agreement between the two governments, Chan could not immediately be sent back to face charges, and his politically loaded case triggered an extradition bill crisis in Hong Kong and soured the city’s relations with Taiwan. In October 2020, the mother of Poon Hui-wing…