What?! After We Married, I Found Out My Husband Is an Ancient Prince!

Heroine's perspective: On her wedding night, she leaves her new husband behind and flies abroad to handle a work emergency. She thinks she'll be back soon, but ends up gone for three months. When she finally returns, she discovers that her new husband seems like a different person, as if he's stepped out of an ancient painting as a refined young gentleman.

Hero's perspective: He is an easygoing prince of the Yan Dynasty, living a carefree life. After taking a nap, he transmigrates to an era he has never heard of and finds himself married. Fortunately, his wife is away, giving him time to adjust.

Note: Both leads are devoted only to each other and each other's first love. Strong heroine. Set in a fictional era.