Season 1

Hard-boiled detective Dongsu encounters Sihyeon with a sketchbook. In the sketch, Dongsu sees figures with his wedding ring on. He soon realizes that the sketches show the future, and that his fiance is in

Dongsu's fiance Jisu is in danger of getting killed by a garage worker, but Dongsu and Sihyeon saves her. Meanwhile, as the sketch represents, sergeant Dojin's wife gets murdered, hence Dojin swears to revenge

Dojin kills Dongsu's fiance by following orders from Taejun. Meanwhile, Dongsu and Sihyeon work together to find out who killed Dongsu's fiance, and Dongsu eventually finds out that it is Dojin.

CEO Nam tries to kill Dojin and solicits the man who killed Dojin's wife, who is in jail. Sihyeon sees this, and tries to prevent them, but ends up being kidnapped.

Dojin heads to where Ilsu is, according to CEO Nam's plan. Meanwhile, Dongsu finds Sihyeon before she dies, by tracing Ilsu's brother.

Dongsu saves Sihyeon and captures Ilwoo. Meanwhile, Dojin fulfills his revenge on Ilsu, but soon gets kidnaped by CEO Nam and his men. Therefore, Dongsu approaches CEO Nam to find Dojin.

Dongsu confronts Dojin once again, but as the bomb he already planted explodes, CEO Nam's men die, yet Dojin leaves Sihyeon and Dongsu to live. Meanwhile, Sihyeon and Dongsu suspects another person

Team Nabi reveals that Ujin, as well as Dojin, has a role of killing potential criminals in the future by following the orders of Taejun. However, Ujin tells Dongsu everything about the truth behind Taejun and his secret supporter

Ujin kidnaps Taejun using the notepad that has the senior's orders. Ujin tries to identify who the senior is, but soon he gets killed by Dojin. Meanwhile, Sihyeon and Dongsu learns that the senior has significance with Sihyeon's father.

Tae Joon offers Do Jin an opportunity to meet the man in charge. Shi Hyun has to decide what she is willing to sacrifice for her brother.

Sihyeon and Dongsu continues to try find who is behind Taejun, while Sijun approaches prosecutor Mungi who has powerful connections, hence orders Dojin to kill the prosecutor's rival.

Mungi wants to meet the senior in person, while suspecting Taejun and Sijun for helping him without any conditions. Meanwhile, Sihyeon is in agony as she draws the death of her companion.

Mungi tries to kidnap Sijun, but knowing the future, Sijun also kidnaps his daughter and threatens him to gain information related to the senior. Meanwhile, Dongsu starts to suspect Sijun.

Dongsu realizes that Taejun's supporter with the ability is Sijun. Meanwhile, Sijun and Taejun knows where the senior will appear, hence they make their final plan to reveal the identity of the senior.

Taejun kills manager Choe and kills himself. Mungi realizes that the senior is not one person but a group involved in powerful organizations that run the country. Meanwhile, Dojin is angry at Taejun and Sijun for not telling his wife's death before.

Sijun sees the future where Dongsu and Sihyeon arrest the senior group, so he tries to kill himself but fails. Meanwhile, Sihyeon and Dongsu continues to use the sketch to fight against the senior group.