I was just solving crimes, how could I become an immortal?

He accidentally traveled to the world of Xianwu and put on this dress. From today on, Cao An is a glorious detective in blue.
People use ghosts to bring chaos to the world, demons carry out injustices, and the conspiracy of the three realms that has been hidden for thousands of years will eventually come to light.
Just before that...
"The detective system, let's do something useful!"
[Congratulations on getting the detective talent: Choose one of three suspects]

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