Despite the disbandment of Rainbow Taxi, Do-ki is still out there going after bad guys. While keeping it from the rest of the members, Do-ki and Sung-cheol secretly help out a father who is searching for his missing son. To confirm his whereabouts, Do-ki sets off abroad to a foreign country to accomplish his first mission.
Quest roles:
Shim So-young(Lim Bok-ja), Lee Young-ae(Rainbow Taxi Narrator (voice)), Cho Ji An(Lee Dong-jae), Park Seong-geun(Kim Hyeong-seob), Yoo Joon Hong(Choi Jin-woo), Yoon Seok-hyun(Sang-man), Lee Eun-joo(Jo Eun-hye), Kim Jo-yeon(Detective), Lee Si-hoo(Detective), Jang Jae-kwon(Landlord), Oh Kyu-taek(Tailor), Park Jae-wan(News Program Guest), Choi Won(Lee Jun-beom), Jang Won-hyuk(Jo Joo-hyuk), Lim Hyun-tae(Kim Young-min), Koo Ja-geon(Recruit), Jang Yong-hee(Lee Dong-jae's Classmate), Choi Yi-sun(Choi Kyung-koo's Coworker)