Everyone Else Cultivates Immortality, While I Rely on a Rule Horror System?

(Gender-bender, 1v1, a touch of angst, xianxia + horror)

1. As long as the rules aren't broken, all harm to the Host is nullified.

2. The Host must identify the correct rules.

3. The rules change in real time.

After an accident, Jiang Yu, a 19-year-old male university student, transmigrates to a world of martial arts powered by vital energy.

She awakens no impressive talent. All she has is a rules-based horror System that has malfunctioned.

What should she choose?

And how can she survive?