An elite drug squad detective forced to drug by someone mysterious reveals the whole story of 20 years of friendship and connection with the death of a friend.

When a gateway opens to a parallel universe in modern-day Korea, a king must step into another world in search of answers to a long-unanswered mystery.

Se-ha who is a physically handicapped and Dong-gu who is a mentally handicapped are not their own brothers. But while living 20 years together, the two became indispensable to each…