Actually,
the situation of the Nightmare Game turned out to be much better than Yi Chen had anticipated,
Catherine not only lacked any petty cunning but also cared a great deal about "fairness," even splitting the nightmare privileges in half, never taking advantage of anything.
It was apparent that Catherine did not harbor absolute malice; she was more interested in finding amusement.
Moreover, there was one thing Yi Chen had entirely not expected, which was the issue of Teacher Zede's strength.
He was so strong that he single-handedly dominated the scores of both players, even killing the pair, who were nightmares, multiple times within the dream spaces.
Catherine was killed to a total negative score, and in the end, she was even forced to use a dangerous last resort that could alter her personality.