Baek Je-na is a third-generation conglomerate and a gold spoon of the highest class at Cheongdam International High School. Kim Hye-in grew up in poverty and is offered a chance to study at the Cheongdam International High School in exchange for her silence on a murder she witnessed. Cheongdam International High School is a homicide mystery that follows Je-na’s rivalry with Kim Hye-in as they are pitted against each other in mental warfare.