The damp lockers are stuffed with dead rats, the red pen graffiti on the desk is covered with curses, and the butterfly birthmark on the back of her neck rots in the shadows - this is the daily life of a girl Su Mian in a provincial key high school. When the transfer student Cheng Ye breaks into her world with a barcode tattoo, the two scarred souls touch each other in the cloud of campus bullying: the disinfectant wipes he hands over cannot wipe away the fake burn scars on her arms, and the butterfly specimens she hides in the glass jar are filled with dates of bullying. The similar "butterfly marks" on each other's wrists are cocoons woven with pain in an attempt to warm each other.
Concept: When pain becomes the barcode of survival