What is the Japanese movie Chameleon about?

In a corner of the city, while waiting for guests, a fortune-teller Koike Yoshiko bored away the time and suddenly appeared a right hand. Yoshiko looked up and saw a lifeless man standing in front of him. His name is Goro Noda and he is 25 years old. One second, he can be in high spirits, and the next, he will suddenly present a dead face without any kindness or smile. Goro lives alone in an abandoned factory warehouse. He used to do some bad things with his friends Gong Jie, Chun and Da Nan, and get some small money through fraud. They live in a world without future and hope every day. However, one day, their lives changed dramatically. On that day, after they cheated some money as usual, Wu Lang happened to witness a kidnapping case on his way back to his residence. The kidnapped person is an important insider who holds important secrets that can shake the Japanese parliament. Since then, Wu Lang and others have fallen into a dangerous situation. The politicians involved are secretly manipulating a powerful organization to try to kill Wu Lang and them. Wu Lang and his friends fought against powerful organizations. His friends died one after another, and finally only Wu Lang was left alone ... Suddenly, a gunshot, Jiazi standing in front of Wu Lang, fell down. As Jiazi said, Wu Lang must pay a huge price for his existence. Now, this lonely man, dominated by the desire for revenge, has begun to fight back against powerful organizations.