The majestic Kangxi Dynasty is about to come to an end. The ownership of the throne has attracted the open and secret struggles of the princes. In the huge palace, there is a murderous intention under the peaceful appearance. At this time, Luo Qingchuan (played by Yang Mi), a girl who should have lived an ordinary life in the 21st century, accidentally traveled to this turbulent era. She is a student of archaeology and has a strong interest in history. Here, she won a place in the palace with her rich historical knowledge, and also met the elder brothers Yinzhen (played by He Shengming) and Yinsi (played by Feng Shaofeng) who were already familiar in history books, and developed feelings with them during their interactions. In the struggle for succession, Qingchuan witnessed the tragic intrigue in the court, and witnessed with her own eyes the history that was different from what was recorded in history books. In the long river, Luo Qingchuan wrote an unknown legendary history...