A former special forces soldier delivers revenge for victims of injustice while working for a secret organization that fronts as a taxi company.
Shaken by an abusive experience, a young woman with an intellectual disability takes up the services of Kim Do-gi and his team of revenge seekers.
With an eye on payback, Do-gi transforms into a deep-pocketed customer to trick Kang Maria's tormentors. Kang Ha-na wonders about a missing criminal.
Do-gi goes undercover as a high school substitute teacher after receiving a call for help from a student who is being severely bullied.
The three bullies' attempts to mess with Do-gi come to a halt when they realize he possesses video footage that could ruin their lives.
While Ha-na looks into allegations of employees suffering physical abuse inside a powerful tech company, Do-gi poses as a new recruit there.
To gain access to Park Yang-jin's inner circle, Do-gi focuses his efforts on infiltrating a key department within the company.
As the truth behind an exploitative incident involving An Go-eun's sister comes to light, Do-gi sets out for revenge. Ha-na shows up with a warrant.
Do-gi finds himself in danger after Yang-jin gives him a cruel test of loyalty. Go-eun returns to locate and destroy the data servers.
Ha-na grows suspicious when she finds Do-gi's ID card at the scene of the explosion. Meanwhile, the team takes on a phone scam case.
Do-gi dons another disguise to lay his charms on the leader of the voice phishing operation. Ha-na keeps a close eye on the team's whereabouts.
Certain that Jang Seong-cheol and his employees are hiding something, Ha-na storms his home. A pastor worries about his missing son.
In mourning, Ha-na goes to Do-gi as a client in search of vengeance. While investigating, the team uncovers a larger scheme at play.
The team is taken by surprise when Baek Yeong-mi empties the secret prison cells. Do-gi plans to use Gu Yeong-tae as a bargaining chip.
When Yeong-mi comes after the team, Do-gi throws himself into action to save them from her cruel clutches before it's too late.
It's the end of the road for Seong-cheol and the team as they agree to shut down their operation. Do-gi is made to face the demons of his past.
The team pulls together for one final mission to nail the true culprit behind the death of Do-gi's mother. Ha-na attempts to resign.
