After following a stray cat in the forest, Ru Xiao Lan finds herself transferred to the past and transformed into a cat. There she meets the minister of Dali Temple, Qing Mo Yan who is currently investigating a murder case in the palace. She is then taken as a pet to help Qing Mo Yan cures his poison. At night, Ru Xiao Lan accidentally touches Qing Mo Yan's blue colour stone and magically transforms back to her human form. Thereafter, she runs away from the temple to try and find a way back home.