A student protester must be able to chant slogans with an air of certainty. A pragmatic legislator has to navigate the ambiguities of politics. Lin Fei-fan has managed to do both. Lin, a former leader of Taiwan’s Sunflower Movement, has been deputy-secretary general of the Democratic Progressive Party (DPP) since 2019. The DPP in January won an unprecedented third presidential term, and despite its activist origins now represents the establishment. Like many DPP politicians, Lin has been fiercely criticised by Beijing. “I just learnt that the Taiwan Affairs Office said I was harming Taiwan,” h…