Delicate And Meek, Me?

Just before his wedding, the tyrannical CEO, Yun Gu, died in a car accident caused by his best friend. His soul reincarnated in LingXi Tang, the youngest daughter of the Tang family who'd died at a young age over 10 years ago. He must use his new identity to protect his teenage self, investigate the reason behind his best friend's backstabbing behavior, and expose his wife-to-be's true personality.