'How does it taste?' It all started with a simple question, but things got weirder.

That night, something weird happened in Kim Seolhyun's house. The next day, her parents left the house, not knowing that their daughter was hiding a stranger in her room. Kim Seolhyun has insomnia and can't sleep at night. Tough, she finds her sleep together with a stranger that likes to stare at her at 3am in the night.

Bangtan's members just moved into their new house. Everything was okay at the start, until they started to hear voices and see weird things happening in there. The seven boys decide to investigate, by staying awake all night, and being alert at everything that's happening.