The Eternal Love.

Mo Liancheng, the 8th prince of Dongyue, is forced to marry Qu Taner, who loves his elder brother, Mo Yihuai. After a failed suicide attempt, Qu Taner wakes up with another soul inside her, causing her personality to shift. As Mo Liancheng grows suspicious, he falls for Xiao Tan, the modern soul, while she tries to return to her world.