this show felt like it was divided into two different stories. the first story was incredibly boring to me. but when the second story started... i loved it! it was really thrilling to watch and i enjoyed the plot a lot. the main idea of the show -the main character having a psychological disorder and having another personality (sorry, i actually dont know how to exactly explain it)- was really fun to watch. lee dong wook and wi ha joon's chemistry was really good, they made a great duo. my score is a bit low because the first six episodes didn't attract me at all and i barely remember anything about that part. however, as i mentioned the last six episodes are so exciting. the cast is also amazing. if you enjoy this genre, this drama is definitely worth watching.