"Flying Tigers: Undercover Operation" is a police film jointly created by Youku and Shaw Brothers International Pictures. It is based on the Hong Kong Flying Tigers and tells the story of the Flying Tigers fighting wits and courage with the gangsters in the face of many serious crimes in Hong Kong and across the world. The scenes of explosions, shootings, battles of wits and strength between police and gangsters, and live ammunition are thrilling and exciting, and the cool fighting is exciting. Gao Jialang is a brave Flying Tiger, while Gao Jiajun is a senior inspector and Gao Jialang's half-brother. The two have many conflicts not only at work but also emotionally. The two people with different personalities disliked each other at first, but gradually resolved their differences during the investigation.