Duel - Season 1 (2017)

Deuk Cheon, Prosecutor Choi, and Mi Rae all begin to search for Choi Joo Shik and get pulled into the world of illegal dogfights.

Deuk Cheon and Sung Joon gain unlikely allies. Mi Rae tries to figure out if Sung Joon knew her mother.

Deuk Cheon is forced to allow Sung Joon to be hospitalized after an attack. Prosecutor Choi and her team research the murder victims.

In exchange for finally seeing Soo Yeon, Deuk Cheon agrees to commit murder. Mi Rae theorizes about who Sung Joon is.

Deuk Cheon contacts Prosecutor Choi to ask for help after making a risky gamble. Sung Joon finds an old friend.

Deuk Cheon's plan involving Park Dong Seol does not succeed and has widespread effects.

Sung Joon goes undercover as Sung Hoon to get Soo Yeon, but finds it won't be easy.

Sung Joon asks Deuk Cheon to give up on capturing Sung Hoon temporarily. Prosecutor Choi gains leverage.

Deuk Cheon, Sung Joon, and their friends set out to find the cure. Prosecutor Choi makes a deal with Dr. Han.

Prosecutor Choi decides on a risky method to collect evidence against San Young Pharmaceutical Company. Sung Joon and Sung Hoon find out more about Dr. Han.

Park Seo Jin panics when her plans fall apart. Dr. Han plans to meet with Sung Hoon.

With Prosecutor Choi's help, Deuk Cheon and Sung Joon go undercover to retrieve Mi Rae after she is kidnapped.

With Soo Yeon's life at stake, Sung Joon tries one last time to get through to Sung Hoon and ends up in danger.