In early March 1926, nine-year-old Peking girl Yi Ziya lost her only sister and was sold by traffickers to a poor theater in a neighboring town while fleeing alone. One day before going on stage, he saw three grapes on the table. He was caught eating them while hungry and was beaten half to death by the troupe leader. He scratched his eyebrow bone with a knife and threw them by the river. He happened to be saved by Chen Hefei, the 12-year-old third son of Shanghai businessman Chen Qingfeng who was passing by. A year later, the Chen family was assassinated by Beiyang warlords. The whole family was burned down late at night. Only the fourth sister, who was married to Peking, and Chen Hefei and Yazi, who missed their return home because of watching a theater, survived. From then on, the two relied on each other and made an agreement. A month later, Yazi was adopted by a kind person, and Chen Hefei left alone to find his fourth sister in Peiping.
After ten years of separation, the two met again, but things were different. Ziya was already an underground member of the Communist Party, but Chen Hefei had changed his name to He Fei and became a Japanese traitor.
The sweethearts who once made promises to each other became enemies, but they still loved each other. At the last moment, one of them died to prove their love.