1. Go to Du Nan police station at the prompt of Lester.
2. Enter the crane yard first (to avoid disturbing people, don't directly enter the police car parking lot next to the crane yard). There is an iron net door leading to the police car parking lot in the crane yard, which is also locked.
3. Enter the police car parking lot and disappear immediately. At this time, a policeman will make a phone call on the left side of the police transport vehicle and stun him near the back.