A blend of detective work, horror-movie thrills, and murder investigation, SPIDER FOREST begins with the gruesome death of a man and woman in a cabin deep within the woods. Left there alone to die by their merciless killer, they victims are discovered by Kang (Gam Woo-Sung.) Kang begins to track down the murderer, but gets hit by a car in the process, and the accident sends him to the hospital. Coming close to death himself, Kang awakes to find himself a prime suspect in the killing of the two people he found dead. As a murder investigation ensues, Kang begins to realize that it is precisely what he cannot remember from that fateful evening that holds the key to solving the case and clearing his name.