Fame. Money. Power. Seo A-ri achieves social media stardom overnight — but deadly consequences await in this glitzy, gilded world of influencers.

Can you actually not show what your true colors are while working with a lot of people? Eun Hwan Ki, the director of the top public relations agency, is a mysterious man known as “The Silent Monster.” No one knows much about him because he always avoids eye contact and appears coldly aloof and arrogant, but in truth he’s an extreme introvert — a PR executive who hates attention and is too shy to be around people. Chae Ro Woon begins to work at Eun Hwan Ki’s company. She is very energetic, the extroverted type and receives recognition for her work, but her only interest is in CEO Eun Hwan Ki. She plans to reveal who Eun Hwan-Ki really is.

A mysterious case happened, involving a serial killer with a claw hammer. Detective Dong Baek and Profiler Han Sun-mi separately chased the culprit.