In 1948, after the "May Day Slogan" was published, a group of patriotic democrats in Hong Kong, represented by Professor Tong Jiangnan, actively responded to the party's call and prepared to return to the liberated areas.The Kuomintang reactionaries obstructed and sabotaged this, and sent Zhang Mu and others with the intention of controlling the professor and others. Su Xing was once a student of Professor Tong Jiangnan. He received the task of the organization and went to Hong Kong to escort the democrats back to the liberated areas, and started fighting with the Kuomintang reactionaries in Hong Kong.A life and death battle.As soon as Su Xing arrived in Hong Kong, the enemy killed Tu Zhe, the deputy editor-in-chief of Ta Kung Pao who was responsible for liaising with Professor Tong, which caused great difficulties in his work.In order to escort Professor Tong and others back to the liberated area as soon as possible, Su Xing started by tracing the murderer of Tu Zhe, dug up Zhang Mu's direct contact Dang Xunqi, discovered the hidden enemy “bee”, and prevented Zhang Mu from taking Professor TongThe plan to leave Hong Kong rescued Professor Tong and his daughter Tong Sheng who were kidnapped by Zhang Mu.On the ship sailing to Yantai, Zhang Mu, who attempted to blow up the ship, was completely subdued and successfully escorted Professor Tong and other democrats back to the liberated area safely.