Zhao Manqian, who had just finished the college entrance examination, was involved in a huge conspiracy because of her stepmother Lin Wanqing brought by her father Zhao Weiguo many years after the death of her mother Su Yu. Lin Wanqing guides her to discover her mother's relics - a wooden box containing a code book, paintings and jade cicada. It is revealed that Su Yu's death is related to the legend of the mysterious organization "Shadow Xiao" and "Jade Phoenix", and the clue points to "Yuntai". However, her mother's last words deep in the wooden box warned Zhao Manqian not to trust Zhao and Lin Wanqing, which greatly shocked her heart. She changed from initial trust to high vigilance, determined to find out the truth alone.
