Di san ge ren (Di San Ge Ren) (2007)

He Wei and Xiao Feng are a perfect couple. Xiao Feng has a younger sister, Xiao Ke, who needs regular life-sustaining medicine. One day, Xiao Ke accidentally discovers that the man who murdered her parents is her sister's husband, He Wei. Xiao Feng becomes pregnant and when she has to leave town on business, Xiao Ke invites He Wei back to her home.