Jang Sung-chul

The CEO of Rainbow Transport. Having lost his own family, he formed the organization to help victims trapped in the blind spots of the law. He leads the team with strong convictions.

Ahn Go-eun

The hacker for Rainbow Transport. She joined the team after her older sister became a victim of digital sex crimes. She is calm and quiet but empathizes deeply with the victims.

Choi Kyung-goo

In charge of maintenance at Rainbow Transport. His younger sister and Park Jin-eon's younger sister were a couple; they died in the same incident while promising to marry. He has a bright personality but carries a great sense of loss.

Park Jin-eon

An engineer at Rainbow Transport. His younger sister and Choi Kyung-goo's younger sister were a couple; they died in the same incident just before their wedding. He is a man of few words, but his reactions and actions are strangely humorous.