[Yes, the male protagonist is a high school classmate, not his former husband!
The period after Yu Changning's death.
She saw her husband crying in front of his grave.
Six years later, she returned to the world.
I saw my husband was on a blind date with someone else.
Ten years later, she returned to the world again.
Her former husband gradually forgot about her. He had a new family and a new wife.
And in front of his grave, there was a bunch of chrysanthemums.
She heard her unfamiliar high school classmate speak.
"Yu Changning, you have been dead for ten years, why do I still like you so much."
Concept: There is true love in the world (from an old saying, not original)
