Teen environmental activist Greta Thunberg sent a letter revealed on Tuesday to anti-communist Hong Kong protest leader Joshua Wong, a political prisoner under the Chinese regime, in which she expressed “love, support, and strength.” Pro-democracy activist Lee Dae-seon of South Korea shared the letter with Vice, which published it on Tuesday. In addition to wishing Wong a “Merry Christmas,” Thunberg expressed support for his cause, called him a “big hero,” and asserted, “you are never alone.”