Jirisan was a series made up of flashback after flashback. If you don't like  flashbacks in your drama (like me) you probably won't like this. It contained more scenes of the past timeline (1991,1995,2019 and many more) than the present timeline (2020). It did not help either when the story in the present timeline was lacklustre compared to the past. The main cast basically did nothing in the present.

The editing of the drama was not that good either. It was all over the place and confusing in a bad way. Like when you start focusing on one part , then the next scene unrelated to the previous scene entered made you easily lost interest with all the questions and answers this drama want us to have with the previous scene.

You know a thriller drama was bad when at the scene where you suppose to have adrenaline rush by watching everyone busy saving lives but here you just felt unconcerned at all  about who just died or about to die or what the disaster's ending .  I recalled my boredom was at peak while watching forest wildfire scene.  I just want to yawn and say 'okay .. next.' The mystery part also was not executed very well. The killer was kinda obvious but our main leads were oblivious despite all the hints and keep focusing on wrong suspects. They made the case more complicated than what it really was.

Jirisan had so much insignificant scenes. I don't care at all about Goo Young 's romantic scenes. Those scenes were dull and uninteresting . The same with resident meeting scene . Don't know what was the point in showing the scene that contributed to nothing . And there were these slow-mo close-up on the faces of the cast when one disaster happened and they keep showing it but in different angles , it was annoying to me . I sure did not want to see the same close-up shot of the cast showing shock faces with no dialogue repeatedly.

The comedy also was  hit or miss. The OST also so and so. Coming from Kingdom screenwriter, DOTS director and with the big names cast, this series indeed was one of disappointing drama of the year.

I can't help thinking  are all ranger's task  truly what depicted in Jirisan? If it is so I have much respect for all ranger all over the world. They are like 'firefighter' of the forest. It was an eye opener to see how forest rangers do their work. CGI was acceptable and good sometimes . If there were flaws, it did'nt bother me much .While the story lacking so much,  the only best thing in Jirisan was its sceneries. Those were shot beautifully.

Overall, I don't recommend this if you are looking for a good thriller mystery drama to watch . There are better drama of the same genre out there. Watch this if  Jun Ji Hyun and Ji Ji Hoon are among your favorite and you missed watching them in a drama.