A missing woman.

The number '6' carved in her door.

The countdown has begun.

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Jung Seohyun is a dectective under a police organisation known as Korean Detective Organisation, KDO for short. She is a serious, work-driven detective that needs no partner to work, after her previous partner, Mark, had died while doing his mission. She is also famous for solving numerous difficult cases but she isn't proud of it at all after the death of her partner. What is worse is that a partner, named Detective Ken, is assigned to her, without her permission.

And she came to realise that her partner is not just any normal partner.

He is from 'The Colossus Clan'.

A world where normal humans hate humans who possess monsterous power and abilities, how will Detective Jung work with Detective Ken to solve this evil-lurking case?