A mysterious taxi appears in front of Cho Do Chul, a sexual predator, who is released from prison today. Do Gi picks Cho Do Chul up with his taxi and disappears.

Do Gi joins Sung Chul in the taxi service business after his mother's death. Ha Na finds the deluxe taxi which Cho Do Chul took but it was all burnt down. She decides to visit Rainbow Transport by herself.

Ha Na questions Sung Chul about the deluxe taxi that went missing. A young boy from high school who lives with his deaf mother, gets in touch with Rainbow Deluxe Taxi to take revenge on his bullies.

No matter how hard Seung Tae tries to sabotage Do Gi, the Rainbow Deluxe Taxi crew manages to handle the situation with its fancy equipment. Meanwhile, Do Gi and Ha Na meet again at the meeting of Blue Bird members.

Do Gi gets his hands on the Seo Young Min case file. Ha Na also goes after this case despite Jin Woo's strict orders to drop it. Now, both Do Gi and Ha Na are after the cruel owner of U data to make him pay for what he did to Young Min.

Do Gi heads to U Data for his first day of work. He figures out that the Strategic Planning Team is the core of the company, Do Gi does everything he can to get transferred there.

Jung Eun's suicide surfaces again, and her sister Go Eun gets a glimpse of what caused it all to happen. Sung Chul and Do Ki do what it takes to bring justice to those involved.

Do Gi arrives at Park Yang Jin's vacation home and starts to search for the data mine. Meanwhile, Ha Na feels guilty that Jin Won is in danger and also heads to the vacation home to save him.

Ha Na finds Do Gi's employee identification card at Park Yang Jin's vacation home. Meanwhile, Kyung Gu loses money to a voice phishing scam. When he goes to report it to the police, he realizes he is not the only victim.

Do Ki disguises himself as a burner phone peddler, Mr. Wang, from Harbin. However, things start to get complicated when Ha Na arrives on the scene of their undercover operation and Jin Eon's cover is blown.

Ha Na closes in on Do Gi and the Rainbow Transport team. She decides to search Sung Chul's house. Meanwhile, Do Ki meets the family of the victim in a murder case involving a missing body.

Ha Na succeeds in getting Gu Young Tae arrested. However, without any real evidence, the prosecution has no choice but to set him free. Ha Na goes to Do Gi, who has already been chasing Gu Young Tae, and asks for his help.

Ha Na asks Do Gi to hand over Gu Young Tae, but Do Ki plans an exchange to get the criminals back. Meanwhile, Sung Mi suggests to the criminals that they get their revenge on the Rainbow Transport team.

The Rainbow Transport team faces off with Baek Sung Mi, Gu Seok Tae, and the criminals. Do Gi decides that he can't stand by and watch his people get hurt anymore, and he sets out for revenge, burning with rage.

A man claiming to be the killer of Do Ki's mom suddenly appears and says that the man who was previously arrested for the crime was just lying. Do Ki, who takes on one last case, must decide how to proceed.

Despite Rainbow Transport's ups and downs, they decide to carry out their last revenge.