Doki picks up Cho Du Chul with his taxi and disappears. Hana traces Cho Du Chul's whereabouts and suspects something strange about the deluxe taxi he was in.

Doki and the team investigate Juchan's factory, discovering that Juchan is abusing disabled workers and committed frauds. Hana finds the deluxe taxi but it is burnt down.

When Jungmin transfers to a new school, violent bullying commences. Doki disguises himself as the school teacher after receiving Jungmin's request.

Seungtae is caught with purchasing illegal drugs, and Doki threatens him. Seungtae decides to call someone for help.

Doki faints on the streeet and everyone worries about his health. He takes the Seo Young Min case file, which Hana goes after as well. Both Doki and Hana are now after U Data.

Doki goes undercover and starts working at U data, a company spreading illegal videos. Meanwhile, the owner Park Yangjin tests Doki's loyalty.

Goeun finds out the cause of her sister Jungeun's suicide, and Sungchul and Doki do everything to bring justice. Hana asks Doki to be their informant.

Doki arrives at Park Yangjin's vacation home and searches for the data mine. Hana also heads to Park's house to save Jinwon.

Hana discovers Doki's employee identification card at Park Yangjin's vacation home. Kyunggu is victim to a voice phishing scam, and goes to the police.

Doki disguises himself as a burner phone peddler and tries to get close with the voice phishing ring's leader, Madam Lim. Things get complicated when Hana also arrives on the scene.

Hana gets close to revealing the truth behind the Rainbow Transport company. Doki helps the family of the victim in a murder involving a missing body, and Hana falls straight into danger.

Hana arrests Youngtae, the prime suspect for Minho's death. But without evidence, he is released and Doki chases after him.

Doki finds Youngtae, and Hana asks him to hand him over but Doki has other plans. The missing criminals plan their revenge on the Rainbow Transport team.

Juchan goes after Jineon, and Choimin goes after Goeun. Furious, Doki sets out for revenge.

The Rainbow Transport team is disbanded, and Doki confesses to Hana. A man claims to be the murderer behind Doki's mom, and Doki must decide how he will act.

Chulyoung turns out to be the actual serial killer behind Doki's mother and Sungchul's parents' deaths. Rainbow Transport decide to carry out their last revenge.