In September 2014, HKFS and Scholarism launched a week-long class boycott against Beijing's decision on Hong Kong electoral reforms. After the strike, the student protesters raided the Civic Square at the Central Government Complex, triggering a 79-day Occupy protest. During the Umbrella Revolution, he rose as one of the student leaders and was one of the five student representatives to hold a talk in a televised open debate with the government representatives led by Chief Secretary for Administration Carrie Lam with HKFS secretary general Alex Chow Yong-kang, vice secretary Lester Shum, general secretary Eason Chung, and another committee member Yvonne Leung in October 2014. He was also one of three student leaders at the heart of the Occupy protests whose Home Return Permits were revoked and were banned from flying to Beijing in an attempt to press their demands for genuine universal suffrage in November 2014. After the protests, he was arrested along with other student leaders.