Two things that Wen Ru regretted the most in her life.
First, he fell in love with Gu.
Second, to marry Gu Zhichen.
Because she loved him, she fell into a trap and didn't know it. Because she married him, she was ruined by him.
He was like the most merciless of men, ruthlessly chopping at the false image of her blissful life. Then he smiled at her and said, "Wen Ru, let's go to hell together!"