How to Keep a Madman as a Pet

“Big Sister, your rationality is the most precious thing I want to tear apart.”

Leng Yuening is the chief medical examiner at the municipal bureau, a believer in order who puts reason above all else.

Su Nian is a sweet-natured new profiling intern and a member of the secret organization “The Observers.” To her, guiding and watching people’s “rationality crumble” is the highest form of art.

A string of murders binds their fates together.

Each victim has a letter carved into them: C, Y, N, L...

When the marks spell out Leng Yuening’s name, and Su Nian smiles sweetly as she holds up Leng Yuening’s scalpel and asks, “Who’s next?” Leng Yuening knows she has found the most dangerous prey of her life.

And the hunter, too.

Su Nian carefully orchestrates events, leading Leng Yuening to investigate the “Collector.” She delights in her cool analysis and looks forward even more to the moment she breaks.

“Look at me, Big Sister,” Su Nian whispers in her ear, her voice bewitching and crazed. “Only I can make you fall from your perfect pedestal and stain you with my colors.”

Leng Yuening pins her against the autopsy table, the blade pressed to her neck, and replies in a cold voice:

“Fine. Let’s see whether you drive me mad first, or I bring you to justice first.”

Neither realizes that, in each other’s eyes, they are the one and only “treasure” that must be kept hidden away.

By the time the truth comes to light, their relationship has already spiraled out of control amid their dangerous games of testing each other...