Smile tells the story of two very different girls who share the same birthday but live two very different lives. Katie (Mika Booram) lives in California with her family. A normal teenager she stressed out about basic American things, such as high school, boys and fashion. On the other hand Lin (Yi Ding) is a teenager in China who was born on the smae day as Katie but was born with a facial deformity which has brought great shame on her and her family. When Katie travels to China on a altruistic mission with a group called "Doctor's Gift" program. Katie learns a great deal from her trip to a poorer country and ultimately goes out of her way to find and meet Lin. Katie learns there is much more to life that what she is used to and her and Lin become good friends.