Hong Ying is a newly graduated college student, and the most "persistent" person in the city's insomnia clinic - she always falls asleep at 3 a. M. After working overtime. She has been able to walk into a "second world" that belongs only to her, half asleep and half awake, since she was a child.
At first, she regarded all this as an escape from reality, until one day, she saw her grandma who had just passed away in reality. As she approached, a big hand suddenly pulled her in. . . .
