Stage representation and commentary of Chinese authors Luo Guangbin and Yang Yiyan's novel "Red Crag" (Hong Yan), depicting the espionage battle against the Kuomintang of a group of underground communist agents during the Chinese Civil War in Chongqing. Main actors: Yu Zhen as Communist agent Xu Yunfeng (narrator), Cao Weiyu as Kuomintang officer Xu Pengfei. Commentary guests: professor Xu Zidong, screenwriter and author Song Fangjin.