SEOUL—Kim Ji-mun, a 23-year-old South Korean university student, had just put up a banner on campus with his friends in support of Hong Kong’s pro-democracy protests when a group of Chinese students tried to take it down.
The encounter at Hanyang University in Seoul led to a seven-hour confrontation, he said, with the Koreans trying to protect their hand-written poster bearing the message “We join the democracy movement in Hong Kong,” and the other side jeering, throwing things and chanting “One China.”
