●The original name of the film was "Clue (clue)", which was later changed to "No Mercy", but the director wanted to convey the opposite meaning, saying that "the protagonist in the film is only from his own point of view and thinks that the other party is unforgivable. The road to extinction is lost, but if you can consider it from the other side's standpoint, or many tragedies will not be staged."
●Sol Kyung-gu lost nearly 10 kilograms of weight to play the role of forensic professor. In the past, he was concise and simple, and he will dress in the film with a fashionable "type of police" style.
●In order to present a realistic post-mortem scene in the film, the makeup artist deliberately took a lot of pig entrails as props for the dissection. Sol Kyung-gu even laughed and said, "I came home with a strong pork flavor. Once my wife thought I came back from a walk around the pork market."
●The first movie based on the Korean National Institute of Scientific Research. The preliminary preparations took more than two years to conduct a professional data search. The anatomical examination room in the film can almost be faked. The working procedures of the search team also strictly borrowed the opinions of relevant experts from the National Research Institute.
●Sol Kyung-gu also asked Han Jilu, an authoritative Korean anatomy expert, to learn about anatomy. When filming the autopsy scene of the broken corpse murder case, Sol Kyung-gu completed all the shots cleanly, and NG did not appear once, so that Dr. Han Jilu present also praised "perfect".
●The film was released a week after the new film " Wedding Dress " starring Song Yoon A. Sol Kyung-gu was unlucky enough to start a box office battle with his wife. He jokingly stated that he had an agreement not to discuss business affairs with Song Yoon A at home, but when he met Kim Hyang Gi , the child star of "Wedding Dress", he jokingly said "No Mercy" to him.
