First of all, what happened in the final scene of the first season? We will never know!
With that being said, i can resume Love Alarm 2 in one word: rushed. The end was understandable, they did a good job showing why Jojo choosed Hyeyoung over Sunoh, and because of that i didn't get more frustrated.
But talking about Sunoh, it really makes me sad the fact that Jojo never gave him a proper explanation of why she installed the shield - even when he asked for an explanation - Jojo's reasons were never explained to him and i have the feel that in this case it'll be so hard for him to get over his feelings for Jojo. On other hand, Hyeyoung was a really nice character but they failed to show him as a interesting person... if you look back he don't have any other interest, it's just Kim Jojo, i thought that with the whole situation of his father Hyeyoung would show a more interesting side of himself... but no!
The scene of Jojo and Sunoh letting each other go was the most beautiful and memorable to me, it gives a big feeling of nostalgia and made me realize that in real life not every first love stay together forever...
For me, the script was really poor taking into account the character were adults and not teenagers anymore. Some things would be more acceptable if the dialogues were better.
I think things in this season could have been better. It was bittersweet ending.