I don't want to be rude but I personally didn't like the season2 of this drama. It was predicted long ago that jojo will not end up with suho. I will not lie, I was never satisfied listening to this but I still watched the season2 because I was curious of how will the writer convince the audience that jojo should end sunho with hyeong and not sunho since most of the people who watched the s1 anted her to end with sunho. So continuing with what I just said, my curiosity led me to watch it but turns out there were no efforts made to convince the audience, but there was just a ending that we had to accept without any explanation. If you have watched s1 you will understand why everyone is shipping sunho and jojo but if you haven't then it is because of the genuine an sweet chemistry they had, and trusts me the s2 only has a single kiss of sunho and jojo but that is the most romantic and memorable scene for me. the reason why the ending was a mess (according to me ) was because
1. jojo and hyeong did not have any chemistry but still ended up together.
2. Sunho was suddenly shown happy and tried to accept yukjo, despite the fact that he still loved jojo and was in the process of healing
3. Jojo's cousin still didn't accept duku gu's feelings and hurt him even when she got to know what all he had to go through for her.
4. It is still a mystery for the users regarding what happened to dukugu and when he said during the last episode when he met jojo to give her the love alarm log that even though my age is 23 i still feel like i am 18. does that indicate that he was not conscious for 5 years and that suicided scene of him in the s1 was real.
5. i was not even sure of why did jojo's shield not removed at the end when dukugu finally made his appearance since he was the developer and according to the drama the developer could remove the shield.
6. There was another scene in the last episode when they revealed that brian chon was dukugu's brother and dukugo stated that he was against the launch of the 2.0 version of the app and at the end he tells his brother to give up on the latest version and behold the title of the developer forever. but there was no conclusion to that statement as well.
in short i would just say that there were a lot of mystery in this season and i seriously want as3 that solves all these problem and has a more cheerful concept.

As for the cast, according to me the cast did a great job in portraying what they were told to portray. The emotions portrayed were seriously excellent. I will be honest, i was crying the whole time i was watching this drama since this was a more on the serious side and mostly because song kang's character sunho was mostly sad and vulnerable for love which he never received till the end.

Sorry for such a long review. and a alert if you havent watched this drama until now and read my review, then i a sorry for spoiling it for you and and as for recommendation, I would say that if you really want some to watch some serious drama ten go ahead watch it .