Yeon-woo, neurologically colorblind, sees colors through Yoo-han in a "color rush." Their connection intertwines with the mystery of his missing mother.

Seon Woo-hyeol is a vampire who wants to become a human but ended up becoming half-human when he woke up a day before completing his 100 years of sleep. Meanwhile, Joo In-hae is a modern lady who shows no compassion about him and only wanted to survive. Will they find love and learn to care for each other now that fate brought them together?