In the 1970s, Shi Jian (Jacky Cheung) and Ha Gong (Eric Tsang) became sworn brothers who fell in love with each other, but because of Falling in love with Xiao Taohong (Anita Yuen) and the relationship broke down. After Xiao Taohong married Ha Gong, the friendship boat was turned upside down, and it lasted for many years, and even the two became feuds.
By 2010, the dilapidated Sai Yeung Choi Street in Mong Kok, Hong Kong has become a favorite, and the merchants are even more tricky to attract customers. However, Big landlords continue to increase rents to force merchants to move out, so as to sell the land at a high price. Merchants who have become accustomed to doing business here began to abandon their previous suspicions and cooperate with each other. Tenants represented by Shi Jian and Ha Gong Interpreting the new generation's love-hate relationship, Ha Gong's son fell in love with Shi Jian's daughter, and Ha Gong's daughter was entangled with Shi Jian's son. It adds a lot of jokes and finishing touches to the film.