In my opinion, before watching the second season, it's better to watch the first season first.

Having caused trouble before, the old cop was transferred to a division with less field work. But still for him, it is very boring for doing nothing on his desk. He will continue to look for ways to continue working with his previous division (first season).

After the first season he was disliked by his coworkers, meanwhile in this season he is suspected by his coworkers. So on, the old policeman also suspects the head of his division. They are suspicious of each other. Until finally everything is solved.

I don't think this kind of storyline is boring at all. Moreover, the background of this story is played with the situation of a policeman who is about to retire. Then before that he had never been promoted.

I have watched this since it aired, then I watched it again because I was bored with the current story. It turns out that the story still makes an impression on me.

Moreover, this genre is my favorite. Maybe it's because the genre, storyline, and casts are all my favorites so I don't feel bored.