In the copy, Bai Zhiqiu's hand was holding the note that shouldn't exist - it was proof of the system's vulnerability.
A cold warning came from the radio: "Illegal behavior detected, please accept punishment." He saw with his own eyes the player next door being swallowed by the wall just because he stepped into a gap in the rules. And he, Bai Zhiqiu, just discovered that he could "see" those gaps.
Others struggle to survive within the rules, but he continues to live by picking up the slack within the rules.
But what he didn't know was that every time he used a vulnerability, the system was flagging him. When the 99th vulnerability player was wiped out, he became the only sample left.
When the next dungeon was opened, Bai Zhiqiu finally understood: he and all vulnerable players were tools for system screening.
The real escape hatch did not exist from the beginning.