Bump Off Lover (2006)

Xu Yi Jing and Xu Yi Zhen were identical twins who grew up always relying on one another. When Xu Yi Jing is murdered, the suspected killer commits suicide just prior to arrest, leading everyone to believe that the case is closed. However Xu Yi Zhen believes there's more to the case and is determined to uncover the truth. As she digs deeper, Yi Zhen is about to discover that the sister she thought she knew everything about was an illusion and that there are darker, uglier secrets that threaten to derail Yi Zhen's whole view about Yi Jing, her family and her past,