The side cases were fine but the main one was too messy, weak and generic in both seasons. The comedy often relied on loudness, repetition and rattling, in season 1 mostly because season 2 wasn't comedic but just dumb silliness. There's a weird down time between some cases that could've been utilized better. Half of the cases either lacked a proper villain or a proper victim. Don't get me started on the endless dumb moves.
Regarding Season 2, it was a significant downgrade. The series became straight up silly. Just from watching the first episode of season 2 I knew exactly what direction they are taking the sequel. A bad one! I was already sick and tired from the obsession over Hyun Soo but this was only amplified with season 2. Which why, in both seasons, the main case was a despicable mess. They even made Hyun Soo more important than the female lead! They could've taken the story in many interesting directions but they decided to copy the first season and make it dumbed down and sillier. There was no need to make a 2nd season in the first place. Season 2 left me with nothing but disappointment. I don't care about season 3 and would prefer not to get one at all. I would give S1 a 5.5/10 and S2 a very generous 3.5/10.
What's even the point of forcing a romantic connection between the leads in season 2 if they weren't gonna do anything with it? It didn't even serve a purpose for the climax. Speaking of which, after endless mentions of Hyun Soo, the drama didn't allow the male lead to interact with Hyun Soo after he found it her identity. After all the commotion, it ended up in vein. Even more, the female lead backstory of her parents death was given less than 10 minutes of attention in both seasons.