Modern agent Ye Qingxuan transmigrates to the Great Wei Dynasty with her rivals, Big Golden Tooth and Zuo Yi, because of a mysterious ring. She gets caught up in a prince’s coup plot and joins forces with the general Xiao Jingheng and the Second Prince to fight their powerful enemies. When Big Golden Tooth gains the ability to travel to the modern world and is discovered by his former organization, X, war breaks out anew. Holding down the fort in the past, Ye Qingxuan becomes the mastermind “Shadow Lord of the In-Between,” directing Big Golden Tooth to infiltrate X in reverse and assassinate its leader, ultimately taking control of the modern organization. She moves between two worlds, both an ancient princess consort and a queen of shadows, writing a legend of control that spans time and space.
