So Captivated I Forgot to Leave

A couple deeply in love, with not a ripple between them. They grew up together, a perfect match in looks and talent, made for each other, devoted through life and death. They fell in love, married, and had a child, perfectly matched in every way. For some reason, she transmigrates into the future, where he has become the emperor. Her feelings are a jumble of joy and sorrow. Then she returns to the past, to the time before they fell in love, and her feelings are complicated. Everything seems different, yet the same. P.S. There are no complicated career plots or grand schemes, just a few things about the foundations of the leads' relationship. It's got that old-school vibe. Theme: Love and marriage, and countless trials