Zheng Yulong stays up late practicing for a singing competition and encounters something supernatural. Later, a photo of an unfamiliar girl named Shangguan Mei leads him to break up with his girlfriend, Xie Yangyang. He uses the QQ account shown in the photo to contact Shangguan Mei, and they chat late into the night again and again, unaware that she has been dead for a long time. Xie Yangyang warns him repeatedly, but to no avail. When she tries to stop Zheng Yulong from going to meet Shangguan Mei, she disappears. On the day of the finals, his rival Liu Tao sabotages Zheng Yulong's voice. Just as things look dire, Xie Yangyang appears and wins the competition with a performance of "Daytime Doesn't Understand the Darkness of Night." In the end, Zheng Yulong recognizes his true feelings and chooses Xie Yangyang, while Shangguan Mei's lingering obsession fades away in the face of true love.
