In the cartoon room, Joo Yeon, who got spoiler, starts the mystery of finding the criminal!

At his mother's 70th birthday party, Yong-nam runs into Eui-joo, who rejected him in college. When the city is engulfed in toxic gas from a terrorist attack, the two must find a way to escape using all the techniques they learned in their college rock climbing club.

The partnership between Ha-neul and Bo-ra start wavering in the midst of launching their startup when their firefighting thermal imaging camera project fails followed by a notice to move out of their studio due to outstanding monthly rent. As things go from bad to worse, a strange man suddenly appears in the middle of their studio, insisting that the place is his factory.

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...