Mo Yan, a talented girl who has just entered the martial arts world and aspires to become the number one chivalrous thief, comes to Kaifeng Prefecture to overturn the case of her fifth senior brother who was wrongly imprisoned. However, she is appreciated by Bao Daren for her keen insight and becomes a female detective in Kaifeng Prefecture. She also becomes a happy enemy with the chivalrous and tender Southern Hero Zhan Zhao. The two uncover layers of conspiracy along the way. Mo Yan not only uncovers the mystery of her own life experience, but also understands the dilemma of "chivalry" and "emotion" in Zhan Zhao's heart...