The sister Liyue of ancient book restorer Li Che "disappeared" in a mirror accident three years ago, leaving only half of the broken bronze mirror at the scene. The official judgment was that it was swallowed by the mirror realm, but Li Che discovered that her sister's shadow would fluctuate abnormally under certain lights. In order to find the truth, she violated the ban and studied the forbidden mirror technique, and accidentally awakened her own shadow "Jhin". Jin possesses Li Che's suppressed ruthlessness and sensitivity, but seems to know the key to Li Yue's disappearance. The two were forced to cooperate, while avoiding the pursuit of the Mirror Defense Bureau, while sneaking into the depths of the Mirror Realm, and gradually uncovered the truth that the balance between the two worlds was broken - someone was using the energy of the Mirror Realm to resurrect the ancient "Mirror God", and Liyue's disappearance was the beginning of this conspiracy.
