Dong Ju was an accountant of a leading company that took care of their secret funds. Dong Ju, who has experienced wealth and success, steps into the NTS following his father's death. Fully equipped with his brazen and crazy personality, he excels as a manager in Bureau Five. Oh Young and Seo Hye Young are his teammates in Bureau Five. Young and Dong Ju start things off with a bad start, but a special occasion brings the two together. Hye Young and Dong Ju have met before, and she has also had a connection with Young in the past. With her ability to act and with her intuition, Hye Young creates a good partnership with Dong Ju.

• Yim Si-wan
• Son Hyun-joo
• Ko A-sung
• Park Yong-woo
• Park Ji-il
• Chu Sang-mi
• Jeon Bae-soo
• Kim Kuk-hee