Fervent Kiss.

After a car accident, Shen Hanxing realizes her lover, He Chen, has been replaced by his twin brother, He Can. To uncover the truth, she pretends to be engaged to He Chen's uncle, Zhong Sihuai, in order to get closer to He Can. However, as her investigation deepens and their relationship grows more complex, Shen Hanxing begins to suspect that the man she's been with all along may actually be the real He Chen.