Drummer Jiang Songping has excellent skills and is competing for hire by various nightclubs. His teacher Su died of illness, leaving behind a daughter, Su Ling. Ping asked her to learn music to seek self-reliance. Ping was a drug addict, and the singer Bai Lu often gave him poisonous cigarettes in order to seek his love. At this time, Su Ling had made a success in her studies and participated in the performance of "Yesterday's Song". Song Ping was very pleased to be greatly appreciated. Bai Lu looked on coldly and feared losing Songping, so she told Su Ling about Songping's drug abuse. Su Ling advised Songping to quit when she learned about it. Unexpectedly, under Bai Lu's design, Su Ling misunderstood Songping. After several excuses, Song Ping finally gained understanding.