Grendel.

A famous psychology professor was killed under the motif of the murder game in the novel. But a young writer Han Joon conceals the killer for immediate success. As a result, Han Joon, the original author of the novel, is swept away by media and public opinion due to copycat crimes, and his life is turned upside down by sudden success. A month later, Han-jun received a threatening letter from Nuance that Han-jun knew the secret of Han-jun with a photo of the mysterious woman murdered, and Han-jun met the woman in the photo with Jeong-hyun, a young woman who helped him succeed.