Ji Xun has been able to see the mist wrapped around other people's bodies since he was a child. The doctor said it was a hallucination and he took medicine for eight years.
Until he was twenty-six years old, he saw the same fog in an old photo, with a nursing home called "Qingshan" in the background.
He paid back the rent, bought a bus ticket, and found the place.
The elderly people in the nursing home are not normal - some are playing chess in the air, some are singing opera in the middle of the night, and some are talking about the monsters they killed in the past.
Ji Xun found that the "air" was filled with his visible obsessions. They are not monsters. They are people who refuse to leave even after death.
