(Palace intrigue / Devoted love / Both leads are virgins / 1v1 / Extra sweet / Past and present lives)
A lighthearted, sweet romance:
Before Xie Rou entered the palace and after, the Emperor had eyes only for her. The day Xie Rou entered the palace, she was immediately made a Lady. A year later, Xie Rou smoothly rose to the position of Empress, and she and Xuanyuan Cang grew old together. The story of Xie Rou, whose favor eclipsed everyone else's in the harem, begins in the year she came of age.
(There are a few cultivation elements.)
From Xuanyuan Cang's perspective:
Xuanyuan Cang, a Venerable Immortal who descended to the mortal realm, is bound by Xie Rou's fate record. While hiding his past, he helps her overcome her tribulation. Fortunately, with Xie Rou by his side, Xuanyuan Cang's days helping her navigate the palace intrigue aren't quite so lonely.