Some of the quotes are memorable.
"The more you hold on to something, the scarier it gets when it disappears."
"You're like gravity to me."
"The pain from the punishment should exceed the benefit/enjoyment from the crime."

It was another law drama which lost its potential because of the loopholes in the story.
Some of the cases and their verdict were Must Watch.
A criminal convict takes place of his twin brother who is a judge and without any help, he knows most of the law language and acts a judge (flawlessly though in gangster manner). Loopholes apart I enjoyed watching this. Yoon shi yoon was all over the drama. His acting was great though he went a little bit overboard trying to differentiate between Kang ho and Soo ho. They could have shown a little bit more of Soo ho as he was intriguing character than Kang ho. It was like the story showed why Kang ho became like the person he is, but they forgot to show how Soo ho became the cold and closed off person.
Lee yoo young felt perfect as her character was naive and innocent at first but later becomes strong. All her roles (Tunnel, you drive me crazy) are very different from each other and she performed fabulous. Another regret of the story was failed to explore Na ra, her character as Joo eun was very interesting but she got very little screen time in the middle episodes. She won my heart towards the ending episodes.
Oh sang cheol was love-deprived person who becomes evil as the time goes on.
Other actors were good in their roles. Nothing extra-ordinary there.

The chemistry and comradeship between leads was cute. You root for them from the ep. 1.

Music was likable, especially loved the song - I see you.
other songs - Comfort, Shine.

People who like to watch Yoon shi yoon, this drama is for you.