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(COMBO) This combination of pictures taken in Hong Kong shows (top image-front R) 20-year-old Ryan, who used to be on the frontlines during Hong Kong pro-democracy protests, posing on a pavement near the government headquarters on June 2, 2020 and (bottom) a file photo taken on August 31, 2019 shows Ryan (C) warding off tear gas with fellow protesters at a similar location. - Ryan used to be on the frontlines during Hong Kong pro-democracy protests, but a year on he has left the streets, fearful of arrest, wracked with guilt over his departure and despondent for the city's future. (Photo by Anthony WALLACE and Lillian SUWANRUMPHA / AFP) / TO GO WITH HongKong-China-politics-unrest-anniversary-frontliner by Yan ZHAO (Photo by ANTHONY WALLACE,LILLIAN SUWANRUMPHA/AFP via Getty Images)

(COMBO) This combination of pictures taken in Hong Kong shows (top image-front R) 20-year-old Ryan, who used to be on the frontlines during Hong Kong pro-democracy protests, posing on a pavement near the government headquarters on June 2, 2020 and (bottom) a file photo taken on August 31, 2019 shows Ryan (C) warding off tear gas with fellow protesters at a similar location. - Ryan used to be on the frontlines during Hong Kong pro-democracy protests, but a year on he has left the streets, fearful of arrest, wracked with guilt over his departure and despondent for the city's future. (Photo by Anthony WALLACE and Lillian SUWANRUMPHA / AFP) / TO GO WITH HongKong-China-politics-unrest-anniversary-frontliner by Yan ZHAO (Photo by ANTHONY WALLACE,LILLIAN SUWANRUMPHA/AFP via Getty Images)