Hong Kong businessperson Lo Hoi-Sing was a former chief editor of the "New Evening Post"; the son of author Lo Fu; and actively participated in and supported the 1989 democracy movement. After the June 4th massacre, Lo Hoi-Sing joined Operation Yellowbird and went to mainland China to assist dissidents in escaping from the country. As Lo was attempting to contact Wang Juntao, a student movement leader who was branded by the regime as a "black hand behind the scenes", Ho was arrested. He was convicted of "harboring counterrevolutionary criminals" and sentenced to five years in prison; he was released two years into his sentence. He was one of the few Hong Kong people arrested as a result of Operation Yellowbird.

While Lo was jailed in Guangdong's Huaiji Prison, Lai Pui-Shing, Li Lung-Hing and others were also jailed there for having participated in Operation Yellowbird. In an interview a few years ago, Li Lung-Hing recalled, "Several people's cells were really far apart; we couldn't touch or see each other. But even though they separated us with those high walls, we were sometimes able to shout to each other, 'Have you eaten?' or 'What are you doing?' With democracy movement advocates Lau Shan-Ching, Wang Xizhe, and a Taiwanese 'special agent', every day I would loudly 'chitchat'. Lo Hoi-Sing was the first to get out. A few times, we heard his voice resounding from outside those high walls, 'I'll see you when you get out! Have something to eat!'" As a result, Lo, Lai and Li became life-long friends.

January 14th, 2010, as a result of complications from leukemia and pneumonia, Lo Hoi-Sing passed away, aged 61, at Queen Mary Hospital. Wang Juntao, one of the 1989 student movement leaders rescued by Lo, said, "Mr. Lo wouldn't know me from Adam, but he was willing to take on the mission of going to the mainland to rescue me. I know that results only come from hard work; it will only be by pushing forward the democratization of China that we will live up to the kindness Mr. Lo showed." Wang Dan, another exiled student leader, said, "I have always thought of Mr. Lo as representing the kindness of Hong Kong people. I am certain that, when the history of the 1989 democracy movement is set down, the name 'Lo Hoi-Sing' will not be absent from those pages."

References: "Apple Daily" (https://www.youtube.com/watch?v=RtCPqtw1Uw0); "HK01" (https://www.hk01.com/社會新聞/23774/六四27-被囚黃雀-獄中以老鼠乾作樂-李龍慶-絕無後悔 June 4th, 27 Years Later: Imprisoned for Yellowbird, Played with Rats in Prison — Li Lung-Hing Has No Regrets)