Dynasty Doctor

This series is about Ping Chang who is a con artist but eventually has an interest in being a doctor. While doing a con, he meets a real doctor-to-be, Cao Tang. They soon become friends, and he gets into Cao Tang's Shifu's hospital. Both guys eventually get to know Shifu's daughter. They think she is weird because sometimes she acts friendly and gentle, and at other times she's mean and rude. Then soon find out that she has had a bit of a rough childhood which makes her have a split personality. The gentle, nice personality is called Su Wen, and the rougher and more rash is Ling Shu. Eventually, Cao Tang falls in love with Ling Shu, while Ping Chang develops feelings for Su Wen. Her symptoms get worse, and she needs to have an operation to let one of them go. Which personality will live and which will die?
(Source: DramaWiki)