A mysterious app promises wishes — then starts a countdown to death. As a group of teens becomes entangled, they must break the deadly chain to survive.

Hundreds of cash-strapped players accept a strange invitation to compete in children's games. Inside, a tempting prize awaits — with deadly high stakes.

Jo I-na finds her uncle murdered beside a puzzle piece but can't explain her presence. Ten years later, as a criminal profiler, she investigates murders where victims are found with similar puzzle pieces.

A kind-hearted nurse working in psychiatry goes above and beyond to be a ray of light for those under her care, despite the challenges coming her way.