99 degrees Fahrenheit is the temperature of the heart. Ling Ling, a psychiatry student, seems to be a straight-laced goody-two-shoes at first, but she's actually a biker girl with a rebellious streak. For her internship, she happens to be placed with Jiu Wu, one of the best in the field of psychology, and they're forced to work together after a disaster of a first meeting. What kind of sparks will fly between the rebellious girl and the cold and cunning man?