Love in the Dark tells the story of the Vampire Prince, Zhu Wuying (Dylan Wang) and a lone alpha Werewolf, Qin Guanting (Johnny Huang). Sworn enemies by law. Their first meeting resulted in claws and sparks flying. However, as fate would have it, the bond they share is deeper than most. What is the difference between Light and Dark? Can they coexist, or will Darkness try to swallow the light whole? The Devil Knight (Ryan Zhang) will stop at nothing to rule the world, even murder. It's up to Wuying, Guanting, and their newfound allies to stop him. Will the prophecy about the Couple of Legend truly come to fruition? Or will all their efforts be in vain?

Five years ago Song Jae Hwa was involved in an accident and now with a single touch she is able to see the past. At first she considered this to be a burden because she started to know things she shouldn't. However, after some thought she decides to use her talent and becomes an investigator. Years after the accident she is know Korea's top investigator and works at Seoul's prosecutor branch office. What happens when she meets Kang Ji Hoon, the new handsome, but talented prosecutor at the branch? What happens when he is about to convict an innocent person? It is up to Jae Hwa, more commonly known as IRIS to help save him.