After Sam’s best friend Chloe returned from a trip to Seoul, everything seemed normal at first, but she started acting strangely in countless little ways. Everyone just thought Chloe had changed, but Sam knew the girl who came back wasn’t her friend. In the investigation, Sam discovered that the real Chloe never boarded the plane to Seoul, and the one who came back was her long-lost twin sister, Ivy Chen. With the help of her foster brother Leo, Ivy studied Chloe’s life.
