After Seon-yoo's father committed suicide leaving behind a large sum of debt for them, Mother and 12-year-old Seon-yoo move to a new place to have new start.

Busan, South Korea, 1970s. Lee Doo-sam is a small-time smuggler. After helping a drug gang to smuggle meth, he falls into the dark crime world. Quick-witted and full of ambition, he eventually takes over the drug underworld and starts to lead a double life: a good community leader during the day but an infamous drug lord during the night.

Yoon, the bride-to-be, waits for her groom Tae-young on the wedding day but he doesn’t show up without a word. Out of concern and rage, Yoon goes out looking for him all day long and in the dead of night, she arrives at a strange place called ‘Café Midnight’, which opens from midnight until the sun rises. In here, Yoon finally finds Tae-young but something doesn’t seem right. He looks few years younger than now and he doesn’t even recognize her. Will she be able to find her groom from the present in this chaos?

In 1999, a robbery-murder case occurs in a small supermarket in Samnye, Jeonbuk province. The police investigation quickly narrows down to three boys from the neighborhood, and these boys are falsely accused of being murderers overnight and are imprisoned without understanding what is happening. The following year, veteran detective Hwang Joon-cheol is newly appointed as the head of Crime Investigation Division. He receives a tip about the real culprits and embarks on a reinvestigation to clear the boys' names. However, the interference of the detective responsible for the case at the time, Choi Woo-sung, leads to everything falling apart, and Hwang is demoted. Sixteen years later, the sole witness of the case and daughter of the victim, Yoon Mi-sook, and the boys return to Hwang, seeking justice...

After a bombing at the school, the father of terrorist Jung Hae-sung sues teacher. The teacher goes around to get a petition with a lawyer and meets the people around Hae-sung. Through them, the teacher hears a story about Hae-sung that he did not know.