On a pitch-black early summer night, a VIP customer visits ‘Sang’ah Moon,’ a company that deals with dreams.

Baek Kiseon, the legendary Night Walker who wrote the history of the industry, is the CEO of Sang’ah Moon. He no longer accepts clients, but is forced to take on a ‘nightmare treatment’ request that he had tried to refuse.

His first meeting with Han Heemyung, a young patient who has suffered from terrible nightmares for a long time and is famous for being a chaebol brat, is truly the worst.

However, Baek Kiseon has no choice but to bring Han Heemyung into his home for treatment, and their uncomfortable cohabitation began with invading and being invaded by each other’s dreams and reality.

It then began to change in unexpected directions during the sweltering summer…

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