The Chaser (2012)

Both have a main character trying to reveal the truth behind someone's death ( in chaser it's his daughter and ghost bestfriend/ many more) both has powerful villains and you hold your breath during the whole drama.

While Two Weeks is about saving the hero's daughter in The Chaser the hero wants to take revenge for his daughter. Both dramas are emotionally very intense and both heroes end up being on the run and fighting against powerful people.

Writen by the same screenwriter, Park Kyung-soo, both dramas involves a corrupt political setting in the best way.

From the same writer. Both are intense drama that deals with a fight for justice against people on higher-ups(politics,judiciary,business). These drama shows how can a powerful person can bend and control law for their own welfare. And how a person can be blinded by money that leads to betrayals.

This drama was written by Park Kyung-soo, the writer of Punch and Golden empire
Several actors of The Chaser are back in parts written by the same writer but in totally different positions and dynamics ..
Same tightly written and well-structured storyline, solid direction, and great cast members' acting skills