Late one night, in the old town of the seaside town, a bizarre murder occurred, and Guan Jingtang, a well-known local old man, died tragically in his villa. The captain of the criminal police, An Ping (played by Han Dong), was ordered in danger, and Shang Jie (played by Qu Jingjing), a high-achieving student of the provincial department, took the initiative to ask for help, and the two fully cooperated and launched a meticulous investigation. However, as the investigation deepens, various contradictory suspicions emerge one after another, coupled with the huge amount of cash that is missing, the familiar woman in red, the blood-red flower pattern, and the intricate interpersonal relationships of the Guan family, make the case more and more confusing. Not only that, but murders are still happening one after another, and the deceased have a lot to do with Guan Jingtang. Anping and Shang Jie withstood the huge pressure, investigated from the source, and turned out an old case, and Anping's master, who is also Shang Jie's father, died because of that case. Finally, Anping peeled back the cocoon, cracked the unsolved case, found out the real culprit behind the scenes who had long been psychologically distorted, and brought him to justice. Shang Jie also walked out of the haze, untied the knot that had plagued her for many years, and was determined to leave behind to inherit her father's legacy and fight side by side with Anping.