Hearing Gu Yang describe Shen Ran's condition, Gu Jin, Feng Jue, and Cao Cuo were taken aback. They had never imagined that the brightest and most cheerful of them all could be suffering from such deep depression.
During the light cone experiment, despite their exceptional talents, they were still young and vulnerable. The trauma they endured led to varying degrees of post-traumatic stress disorder.
For a long time, Gu Jin and Feng Jue struggled with sleep disorders. It was only through Gu Yang's piano playing that they found relief. Each of them had their own ways of coping with their trauma, often leading to self-abuse.
Gu Jin's self-torture was psychological. She repeatedly revisited their traumatic past, mentally disassembling her own world, which contributed to her sleep issues.