Kingmaker (2022)

Both have a fixer who can go anything to make their representative leader.
Political based drama .
Struggle to keep political and personal life apart.

Starring Sol Kyung Gu
Playing real life historical figures. One is a inexperienced actor and the other is playing in the shadow of a president.
Acting in both are excellent.

Both took place around the 1960s, and are heavily political. In a way, Uncle Samsik feels like the kingmaker/strategist role and Kim San the person he is trying to make into a leader.