According to the director, the reality of economic investigation and catching international fugitives surprised him since it was far from what he initially imagined.
“My impression of overseas pursuits mainly came from news reports, so it was more of a conceptual understanding,” he stated, adding that now, he knows that the investigative logic that involves these crimes differ from the investigations most people are familiar with.
While the process of criminal investigation puts heavy weight on reason and searching for the suspects as dictated by the evidence, an economic investigation is more challenging in a way that it is extremely hard to prove that the suspect committed a crime even if you already know who they are. Because of this, it becomes a huge puzzle that needs a lot of patience to be solved.
Liu also stated that when they were talking to the real-life officers in the development of the show, he was touched by the stories he heard and this inspired him to integrate it into the show. For example, one officer who travels to different countries admitted that he just spends a third of the year with his family. One time when he returned to China on Chinese New Year, he saw twinkling lights as he landed, and he later on realized that it was fireworks. This made him realize that he was finally home since China was the only country who celebrates the momentous night.