She is Li Yin, a female college student in the 21st century, and he is Zhao Ye, the prince from a thousand years ago.
Fate made them meet, fall in love, break up, feel pain, say goodbye, and leave.
Later, he became the emperor and she became the imperial concubine. She knew he would die young, but she didn't know her own fate.
As for Shen Qing, he just fell deeper and deeper into it, knowing his mistakes but not correcting them, and never regretting them.
Intention: The love you couldn't get when you were young will be unforgettable in this life.