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The story takes place in 1951, not long after the founding of new China. Many terrifying events happened in a small city in southwest. A key figure died and became a red spot corpse. Public security officer Lu Fei began a difficult investigation... Obviously, this kind of anti-spy drama cannot be without an eerie atmosphere. The main actors Liu Xiaofeng and Wang Wu mentioned that they were scared several times while shooting, for example, running wildly in the graveyard on a dark windy night or hearing intermittent dripping water sounds in an old house at midnight... These often made people feel creepy. However, Liu Xiaofeng said that being scary and mysterious was only a small side of the whole drama. It was more like an intelligence game. "To make an anti-spy drama interesting, it is definitely not about us performing and the audience watching. Instead, while we are performing, the audience is guessing with us. The character I play is more like a detective Wei Si Li. He is always analyzing problems and reasoning cases, unraveling them bit by bit, and leading the audience to solve the case. This drama is actually a multiple-choice question. Everyone around seems to be an enemy, but having a corpse does not necessarily mean that person is dead, and doing bad things does not necessarily mean one is a bad person."

Because of his handsome appearance, investors rarely ask Liu Xiaofeng to play villains, which has become a knot in his heart. Liu Xiaofeng unintentionally mentioned a currently popular drama "After Landing, Please Turn On Your Mobile Phone", believing it to be a very excellent script. But he also said boastfully: "Sun Honglei looks like a bad guy at first glance, so he is trying hard to perform as a good guy. I look like a good guy at first glance, so I am more suitable for the role of Shen Kang than Sun Honglei."