Connection is the story of Jae Kyung. He is an ace detective who is hell-bent on his job and does not allow even the slightest emotion to come between his work. The wall of his room has been burdened with his past which is a clue to the secret the man has been carrying within him. His strong conviction takes a pitfall when his twenty-year connections with friends and foes question him about his own choices.
Being a huge fan of Ji Sung, this story has been my must-watch ever since its announcement. He brings nuances into his psychologically strained character making them intriguing. As the story keeps on going past while tackling issues of the present, suspense builds around what happened twenty years ago. Helmed by the man behind "Lovers of the Red Sky", a connection has severe darkness etched throughout. The character Yoon Jin portrayed by Mi Do is another mystery to be read along. Her Yoon Jin also bears a big baggage like Jae Kyung. The upright and assertive she is gets clouded by an unfair dismissal.
The task of a writer involves giving space and breakages to every character which builds a story. The way past and present clashes help in intensifying the connection between leads throughout. The use of black and white color outfits works as the element to exhibit what those cloth wearers are feeling inside. There is no color left in their lives. The drinking scene at the beginning where Jae Kyung mostly stays silent and only pours a drink to everyone describes his social ineptness.

The biggest element of a crime thriller is to maintain the pace. Director Moon Kyo did a terrific job of keeping the motion strong while bringing unprecedented twists with each scene. The gap between the present and past is what this connection is about.