After Tae-heon leads a massive operation that takes down a notorious syndicate of gangsters, Ji-tae’s world comes crashing down. Having lost both his livelihood and his intimate partners to the prosecutor’s sweeping sweep, Ji-tae finds himself entirely isolated and destitute. Consumed by a desire for vengeance, he launches a relentless campaign of explicit, sexually harassing letters targeted directly at Tae-heon. When the ceaseless barrage of mail begins disrupting his investigations, an infuriated Tae-heon sets out to hunt down the culprit responsible. However, once he finally unmasks his tormentor, Tae-heon is stunned to discover that the sender is none other than his former high school classmate, Lee Ji-tae.