Gu Tong discovering Bei Jiafei singing in the warehouse was indeed an unexpected event.
During Bei Jiafei's hospitalization, she was in tears every day. She cried out, "I've already been hiding in the warehouse, Qiu Xue, why are you still pushing me? What exactly am I obstructing for you? Why won't you just let me go..."
These words are still vivid in Gu Tong's mind.
...
"Let's not talk about this..."
Bei Jiafei scratched her head, not wanting to mention it.
"What if I insist you must say it?"
Gu Tong was somewhat forceful, not for any other reason, but because she had to understand how far things had progressed in order to make the right judgment.
"Uh..."
Bei Jiafei hesitated for a bit. Realizing Gu Tong's insistence, she pursed her lips, feeling very conflicted inside, and said, "You know the nightingale of the arts class, Qiu Xue?"
"Uh-huh."
No need to guess; it must be related to her.