What Louis Koo said is true.

In the movie, Zhang Jingchu was addicted to drugs. After getting a shot on the inner thigh, with Piao Jin and Daniel Wu doing it on the sofa, Daniel Wu felt the needle hole on the inner side of Zhang Jingchu’s knee. Because no blood vessels could be found in the arms, the blood vessels were transferred to the inside of the knees. When the inside of the knees was no longer enough, the blood vessels were transferred to the inside of the thighs. This was done gradually. When Louis Koo was taking drugs, he obviously stuck needles in his arms, so he definitely didn't take drugs for as long as Zhang Jingchu, and Zhang Jingchu's location of the needles, physical condition and climax all betrayed her.

The last time Zhang Jingchu injected drugs was to "open the skylight", and Louis Koo also said that the injection was powerful. It seemed that the amount of drugs was also very large. The drugs entered the brain directly along the blood, causing Zhang's heart to be unable to bear it. , died suddenly on the spot. Drugs destroy not only oneself, but also a family or even several families.

Extended information:

"The Disciple" Brother Kun (played by Andy Lau) who lives in Hong Kong ostensibly runs a small shop and does small business, but his true identity is to control a huge drug trafficking company. The drug lord boss of Maoluo, his wife (Anita Yuen) already has two daughters, and now she is pregnant with Liujia, which gave Brother Kun the idea of ??washing his hands in a golden basin.

In fact, her wife already knew about his background as a drug lord, but she never revealed it just for the sake of the family. Ali (played by Daniel Wu) is a "disciple" who has followed Brother Kun for many years. His true identity is actually an undercover police agent. Although he gained Brother Kun's trust, he had never been able to grasp the details of drug production and trafficking, which made him very distressed. Just when he was discouraged, Brother Kun suddenly wanted to take him to Southeast Asia to delve into the secrets of drug production. base.

Fenfu (played by Louis Koo) is an addict. His wife Afen (played by Zhang Jingchu) became addicted to drugs in order to prove to her husband that people can quit drugs. In order to facilitate his own drug use, the unscrupulous husband actually forced his wife and three-year-old daughter to sell drugs for him. Ah Fen accidentally met Ali when he was eager to quit drug addiction, and the two unknowingly had a subtle emotional entanglement.

Baidu Encyclopedia-Disciple