Maybe like others, i jumped in with high expectation seeing how good the show was in season 1. But then i kinda regret it. Here's the things: The acting was still good like before. The musics were the all reused from the previous season, and this time, it was a bit overused aka too much music playing from time to time. The cases were lame compared to the previous, and unlike the first season which had balance between action & comedy, this time it focused more on comedy side. And the product placement ads for that coffee candy (sigh...)
Perhaps the biggest flaw came from the scripts. In season 1, the character Go-eun didn't have much showtime so her unrealistic hacking skill was not too obvious. But not this time. She became like the world's numero uno hacker. It was totally so unrealistic, to a point that she could close a random gate in Vietnam. ? She could hack all things, period.
So, to sum it up, it wasn't better than the season 1. Still a good show, though if you want to watch it.
I'll give the season one 8.5-8.7 score, and this one an 8.