Nam Shin is a son from a family who runs a large company. After an unexpected accident, he falls into a coma. His mother Oh Ro-Ra is an authority on brain science and artificial intelligence. She creates an android named Nam Shin III which looks like just like her son Nam Shin. The android pretends to be Nam Shin and he has a bodyguard So-Bong.

It tells the stories of a group of teachers and students from a central fictional school in Madrid. Under the gaze of some new teachers, newcomers to the center, we will know the passions, interests, aspirations and dreams of a group of rebellious teenagers who are in their last years of high school.

Set during Christmas 1988, Lol is haunted by the devastating events that took place two and a half years before. She and Woody both find themselves struggling to cope with their lives without each other after he leaves the gang. Lol is carrying the burden of her guilt, whilst Woody is trying to build a domestic life with a new girlfriend and a potential promotion at work. Shaun has started drama college and, although still in a relationship with Smell, he has grown close to a girl performing in his Christmas play.