The blind Yip Man-chiu was abandoned at birth. Following the death of his foster parents, the boy is sold by his uncle Ah Sam to a blind Taoist priest, an abusive man. Running away from home, Yip is hit by a car and sent to a school for the blind by the social security workers. His talents impress the musician Siu Kwong and wins him a place in a music school for the blind. There he is joined by fellow students Lung Kwok-kei, a runaway child with an abusive stepmother, Chow Kuen, an abandoned child found on a train, and Cheung Kin-ching, an avid music lover sent to the school by her loving well-to-do father. The four children blossom into accomplished musicians under the tutelage of Siu and his wife and together with the less fortunate others, form an orchestra which earns a reputation for excellence.

Yu Kwok-Kei cannot pay his debts and disguises himself as Ma Ka-Wai, his cousin Yu Lan-Fun's fiancee. He tries to kill Lan-Fun. A fisherman saves Fun. She believes that Ka-Wai was the attacker, but she can't understand why. After Fun has been missing, her family puts an announcement in the paper. Meanwhile, Chan Lan-Fong, who just comes to Hong Kong, looks like Fun and is brought to Yu's home. Fong's habits are totally different from Fun's, and she cannot recognise the family, who thinks Fun has amnesia. Fun knows that her family has mistaken somebody else for her, so she goes back home secretly and teaches Fong her habits and customs. Fong does what Fun tells her, and the family thinks that she has recovered. Kwok-Kei has a guilty conscience, so he disguises as Ka-Wai again, intending to kill Fun/Fong. But he fails and got arrested. Everybody learns that Kwok-Kei wanted to kill Fun. Moreover, Fun's mother discovers that Fong is Fun's lost twin sister and the family is reunited.

In high society there is a Madam Rose. Shum Chung-kei meets her and is enthralled. They begin dating. Kei knows very little about Rose. When Rose was little, her father Fok Wing-sum was betrayed by his business partner Shum Hung, who made him lose all his money. Hung was put in jail. Years later, when the Sino-Japanese war broke out, Hung reappeared as a spy. He arrested Sum. Although Sum escaped later, Hung caught his wife, who died later. Madam Rose wants to find Hung's offspring to take revenge. When she confirms that Kei is Hung's son, she approaches him. They are getting married. Kei invites his father to the wedding. Rose and Sum are anxious. However, Hung is alert and comes quietly. He discovers who Rose is and her motives. Rose and Sum go to Hung and they fight. Hung is guilty. He tries to jump off a cliff. Sum saves him. The enmity disappears. Kei and Rose stay together.