The Girl in Red is a coming-of-age story about an intelligent and outgoing high school girl named An Ran (played by Zoey Ching Tian). She believes in upholding justice and honesty, even if it means standing alone against her classmates. When she points out a teaching error to her teacher in front of the class, she finds herself unsupported by her peers. With her family's guidance, An Ran learns valuable lessons about perseverance and staying true to oneself as she navigates adolescence and prepares for adulthood.