"My Queen of Hearts, whichever potion you choose, we go down the rabbit hole together." Detective Kyungsoo was assigned to investigate the drug ring of the Pillar (short for Caterpillar), a new hallucinant that put the user into blissful dreams but blurred the perception of reality and dream. Fem!Kai was the drug ring leader aka "Queen of Hearts". After a shared drug experience together, Kyungsoo and Kai fell in love. Two new potions however put them at a crossroad...