It's very rare for a drama to be able to have two seasons. But the story is so rich and full of mystery while matched with incredible, deep, well-written characters that you can have two seperate seasons with different stories and have room for one more (hopefully). There were many different side-plots and stories that were all perfectly combined together to create a perfectly puzzlling experience that keeps the audience engaged from start to finish. Sometimes they were included to give the characters something to develop outside of the story, sometimes they were apart of the over-arching story. Each served its purpose superbly. It's one of those drama that doesn't forget earlier scenes that seemed like filler at the time, rewarding viewers for paying attention despite it's complicated script.

Cho Seung Woo and Bae Doo Na perfectly reprise their roles as the stubborn Prosecutor Hwang Si Mok and emotional Inspector Yeo-Jin. They are on the opposite sides but they are still a great unit of justice and ethical rights and wrongs. Plus they are a little more romantic than in previous seasons, furthering their warming chemistry. But that's not all. The additions to the S2 were splendid. Jeon Hye-jin as Choi Bit and Choi Moo-sung as Woo Tae-ha were brilliant as the counterparts to our main leads. Both are the bosses of the other two but have a more grey sense of justice and priorities. Their relationship was just as riveting as it was interesting. Lee Joon-hyuk had a limited yet pivotal role. Her was able to keep the same essence of the Seo Dong-jae character while getting more likeable and friendly with Shi Mok. Yoon Se-ah coming back with a stronger role as Lee Yeon-jae was another great inclusion to the show. An extra flavour in the world that Stranger is built upon.

Would watch again. In fact, I might revist the S1 and then come back. Must-See!