In his senior year of high school, Chen Mo posted anonymous love letters all over the campus, with "Please take care of her for me after I die" written on every page. Su Niannian looked at the entire wall while crying, turned around and said to everyone, "This is my cancer suicide note." A misunderstood love letter tore open the secrets and fears of two young people. When the whole class thought it was a prank, only best friend Lin Xiao knew the truth. Zhou Yi, the student union president, fell into self-blame during the investigation, while class teacher Lao Zhang and school doctor Sister Wang used their own scars to guard this secret that was about to be broken. At the junction of life, death and youth, Chen Mo learned not to escape, and Su Niannian learned not to bear it alone.