Fourth has been in love with a mysterious masked street singer known only as "Midnight." Every Friday night at the park, Midnight appears with a guitar and serenades strangers with heartfelt love songs. No one knows his real identity. What Fourth doesn't know is that Midnight is actually his childhood best friend, Gemini.

Krist, a clever but hot-headed toy designer, has spent three years brightening his workplace with his sharp wit and chaotic charm. One night, he bumps into a stranger and drops a photograph, showing him standing beside the very same man, though he has no memory of ever meeting him. Years later, the stranger returns, warning Krist not to accept his long-awaited promotion and claiming to be from the future. He knows things no one else could but how can Krist trust a man he can't remember, yet who seems to know him better than anyone?