Kyungsoo suffers from insomnia because of his struggle in the job market. One night, he goes for a walk in the park, and is captivated by Siyeon’s beautiful singing. At first, he doesn’t even know the title of the song that she’s been singing, but soon finds out from her that it’s a haunted song. Still, he longs to hear the song to soothe his insomnia, and secretly records it···.
Min-gyu, Soo-yeon, Young-suk, Wisdom, and Cho-hye go to a three-room pension. Solo Cho Hye-man sleeps in the attic room of Fumijin, and the rest of the friends are couples, so they are assigned a good room. Cho-hye, who is full of heartache, suddenly falls asleep in the attic and has a strangely vivid dream. In a dream, she has a hot sex with friend Suyeon's lover Minkyu. The next day, Cho-hye, who had been in a troubled mind, comes to the attic with another friend Wisdom sleeping. And while they're sleeping while chatting, Min-gyu and three have the same dream of having sex at the same time. And when they wake up, they sense that there is something weird in the attic ...
