After graduating from the police academy, Yan Mo, unable to come to terms with the mysterious death of his close friend Xia Qian, he vowed to bring the killer to justice. With the help of his friend Si Xiaokong, he set up a modest detective agency-first, to make ends meet; second, to put his police academy training to practical use; and third, to track down the killer who had victimized his friend. After a series of incidents, Yan Mo found himself increasingly shocked by what he uncovered. Should he back down or get to the bottom of it? At that moment, he truly wavered.