Main •
Jin Goo as Go Tae-rim, an arrogant lawyer but has a 100 percent success rate in his cases. •
Choi Seung-hoon as young Go Tae-rim •
Seo Eun-soo as Seo Jae-in, a passionate rookie and righteous lawyer.
Supporting People around Tae-rim •
Lee Soon-jae as Goo Se-joong, a notable lawyer and the saviour of B&G Law Firm. •
Jang Yoo-sang as Kim Yi-soo, an informant.
People around Jae-in •
Moon Ye-won as Nam Sul-hee, Jae-in's university friend. •
Kim Ho-jung as Professor Song, Jae-in's guardian. •
Ahn Nae-sang as Seo Dong-soo, Jae-in's father.
B&G Law Firm •
Kim Byeong-ok as Bang Dae-han, the CEO of B&G Law Firm. •
Chae Jung-an as Min Joo-kyung, a partner lawyer who has a great source of information. Her looks contradicts her personality. •
Jung Sang-hoon as Yoon Sang-goo, an ambitious lawyer who dreams of beating Tae-rim. •
Gu Won as Sung Gi-jun, the heir of Hankang's Group.
Special appearances • Joo Suk-tae as Lawyer Yoo (Ep. 1–2) ==Production==