A fantasy melodrama that traverses dreams, reality and the time-space continuum. It is the story of two lovers who cross paths again in the dream world, not in real life, after a thousand years. Lee Soo Hyun is the CEO of a gaming company who uses his own dreams as the basis for an online game called Lucid Dream. When one of his part time employees, on leave from art school, reads Soo Hyun's script, she finds herself thrown into confusion as it starts coinciding with her own dreams where she also meets Ma Moon Jae, a man who existed a thousand years ago...