City of Exotic Beasts.

Summary

In a tense scenario, Qing Ling and Gao Yang are surprised by the simplicity of a test presented by Bai Tu, which involves killing a seemingly innocent character, Niu Xuan. Despite Bai Tu's insistence that killing "lost ones" is necessary for their organization, Gao Yang questions the morality of the act, leading to a standoff. Ultimately, both he and Qing Ling refuse to kill, citing a belief in a natural order. Bai Tu, impressed by their resolve, reveals that they have passed the assessment but are still in a probation period. They receive a brass key with the task of finding its corresponding door in the Qing Mountain District, marking the next step in their journey.

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