Su Wan was pulled into the infinite stream, and encountered the classic start of "finding the murderer" in the first instance.
When others look for clues, she looks for evidence; when others kill the BOSS, she directly interrogates the BOSS.
The reward for clearing the level is a "blank IOU" which reads: I owe you an answer.
Later, all the NPCs in the abyss learned the same sentence——
"Don't fight her, pay back what you owe, and you can still survive.
