K-dramas are known for their romantic, historical, and revenge-based storylines, but hidden in between the most popular genres are detective stories. The best detective K-dramas contain a well-written mystery that even its most attentive viewers won’t be able to solve right away. Many detective series follow a similar formula in which its protagonists are compelled to return to crime-solving after leaving their jobs due to traumatic events. Such is the case in K-dramas like Hello Monster and Tell Me What You Saw.