After barely surviving a brutal attack by a sadistic serial killer, crime boss Jang Dong-su is left humiliated. Determined to catch the killer known as K, he forms an uneasy alliance with Jung Tae-seok, a relentless and incorruptible detective who often disrupts his illegal business. However, while Jang Dong-su wants K dead, Jung Tae-suk is determined to bring him to justice. With a deal in place—whoever finds K first will decide his fate—the hunt begins, blurring the lines between crime and law.

A failing webtoon artist finds he's drawn a target on his own back after publishing a story containing real secrets from his former life as a superspy.

After moving into a new house, a young girl begins displaying strange and disturbing behavior until, one day, she disappears behind a closet. While the devastated father is left with no clue about his daughter's disappearance, an exorcist shows up to help.

Young-hee visits a peaceful seaside village after losing husband and son meets Jun-woo who also comes to the village for 6-weeks rest after going through retirement and wife’s affair. One late night, Jun-woo who’s suffering insomnia sleep walks into sea, but Young-hee saves him. Young-hee notices Jun-woo’s broken heart and tries to help him by taking care of his summer cottage. Despite the different background, they slowly get closer and classic music becomes an instrument connecting hearts of these two lonely and hurt souls.