Bad and Crazy (2021)

Soo Yeol, a skilled but morally compromised officer in the Anti-Corruption Unit, faces a turning point after meeting K, a righteous but eccentric man. Despite his high school diploma, Soo Yeol has climbed the ranks by catering to his superiors' desires, often ignoring justice in the process. As promotion time nears, he fears being left behind, especially after his hopes with Congressman Do Yoo Gon are shattered by K's arrival. Together, the "bad boy" and the "crazy guy" form an unlikely partnership—bringing both chaos and change. (Source: MyDramaList)