The first half of "Bullet in the Head" is based on John Woo's personal experience. John Woo wrote all his experiences when he was young, such as the smashing of the wooden house area and the feelings between his friends, into the script
. In the script, the two roles of Huizi and Xirong are the portrayal of John Woo's friends, and the role of Ah B comes from John Woo himself. When John Woo was a child, he had a friend who lived in a slum. He often went to fight, and later became good friends with John Woo, and he was the prototype of Huizi. John Woo has a neighbor who was born in a poor family, but he worked very hard. From a hotel waiter to a general manager, John Woo's neighbor is the prototype of Xirong
.
In order to strive for truth, the creative staff spent four months collecting information. Whether it is the current events and historical facts of Hong Kong in the 1960s, or the social background and culture of Vietnam, the creators have devoted a lot of effort to collect information. As long as some news materials and even war scenes can match the plot, the main creative personnel turn those fragments into drama
.
