Kim Han-gyul was a child prodigy, born to act. Using his ability to see ghosts, he was able to deliver a captivating performance that helped him stand out in the competitive industry. All the other child actors admired him, and it seemed like he had a bright future ahead of him, until the mysterious red thread appeared. From that very moment, his life became mired in disaster. Ten years later, living an ordinary life and putting his childhood fame behind him, he finds out that the red thread on his finger leads somewhere – a black thread attached to childhood actor-turned-superstar, Jung Eunhan. Their similar pasts have to mean something, but what secrets lie behind these ties that bind them?