The King Defends His Queen – Kong vs. T-Rex Fight Scene

 The King Defends

The protagonist, Park Tae-su, comes froma poor background and dreams of power. 
KoreanDrama.org
Justdial

He works hard, goes to a top law school, becomes a prosecutor. At first he tries to do things the honest way, but struggles with frustrations — low recognition, bureaucracy. 

Justdial
KoreanDrama.org
Eventually, he is drawn into the orbit of Han Kang-sik, a powerful, influential prosecutor who holds a lot of real power behind the scenes. Joining his clique gives Tae-su access to money, prestige, and power.

Some of the main cast and their roles:

Jo In‑sung as Park Tae‑su – the protagonist, who rises from poverty and aims to gain power. 
Wikipedia
Asian Film Fans
Jung Woo‑sung as Han Kang‑sik – a powerful prosecutor who has authority behind the scenes. 
Wikipedia
Bae Seong‑woo as Yang Dong‑chul 
Asian Film Fans
Ryu Jun‑yeol as Choi Doo‑il 
Asian Film Fans
Kim Eui‑sung as Kim Eung‑soo 
Wikipedia
Kim Ah‑joong appears (role: Lim Sang‑hee) 
Asian Film Fans
Jung Eun‑chae (Park Si‑yeon) & Kim So‑jin (Ahn Hee‑yeon) also have supporting roles. 
Asian Film Fans