Hong Gildong (played by Lee Je-hoon) is a private detective with no fear, no sympathy, no memory, and no friends. The success rate of solving entrusted cases is as high as 99%. The person he is looking for usually takes less than a day to find. However, the only thing he cannot catch is the murderer of his mother, Kim Byung-deok (played by Park Geun-hyung). When the case finally had a clue, it was discovered that Kim Byung-deok had been kidnapped. While tracking his whereabouts, Hong Gil-dong fell into a huge dark organization and discovered the truth about the mysterious organization Guang Enhui. At the same time, the mysterious man Kang Sung-il (played by Kim Sung-kyun) has been monitoring Hong Gil-dong's movements...
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