Lin Yin, a freshman in high school, accidentally discovered a secret. She began to suffer from angina and began to bleed for no apparent reason. When pain became the only thing in her life, she suffered from nightmares, illness, and life was worse than death.
Nearing the edge of despair, she and her classmate Ning You began to think about the source of all this, but they were surprised to find that their neighbor Fang Quanxuan was an insider and what happened.
The three of them explored together, trying to uncover the foggy past, but discovered the secret behind the secret, and got deeper and deeper into this unsolvable mystery...