[1] CID investigator Szeto Shun (Kevin Cheng) becomes the prime suspect of an arson case when surveillance cameras capture a culprit who looks identical to him.

To prove his innocence, Szeto resigns from his position in the police force and takes up a job as Head of Security at the swanky Y Suite Hotel.

He decides to solve the arson mystery on his own, but not without the help of his former colleague, CID detective Scarlett Wong (Lin Xiawei), who seems to be the only one who believed his innocence.

Small time private investigator Jan Ng (Tavia Yeung) falls in love with Szeto at first sight after seeing him take down a gun-crazed criminal.

During this time, Szeto befriends security guard Cheng Nik-hang (Ruco Chan), a seasoned thief in disguise, who infiltrates the Y Suite Hotel to find a stolen treasure.