Xu hope, a junior at Gangneung Medical College, works two jobs to treat her mother while doing experiments at the affiliated hospital.
One day, she comes into contact with Gu Nian, a strange high school student tutor—this girl can "go back to the past." She was able to retract her steps half a second before she fell, and she was able to put the broken cup back on the table intact.
Looking back was originally just a little secret that Gu Nian used to fight against life. Until the college professor Chen Yuesheng noticed her and pulled Xu hope, Gu Nian, and graduate student Jian Chen into the same laboratory.
Experiments in the name of "curing diseases" and "changing destiny" gradually went out of control: ethical review was bypassed, data was beautified, trauma was amplified, and backtracking pushed them to the depths of irreversibility.
Between the rooftop, the ward and the prototype, the three girls were forced to answer the same question - when "a better world" and "someone's pain" collide head-on, who is qualified to press that switch.
This is an experiment about retrospection and choice, and it is also a story about a few ordinary people trying to gain a little freedom for themselves and each other in the flood of time.
Purpose: Reflect on the boundaries between technology and ethics, and respect the life choices of every ordinary person.