Back to high school at 27 years old.. Mmm

I had high expectations but after episode 12 I decided to drop this one. The plot is slow and the idea of a 27 year's old boy going back to his high school is not realistic at all. The fact that the main characters involved did not speak for 9 years and never ask anything about a certain important event is also something which i think not very plausibile. Unfortunately if a show disappoint me like this I would not continue watching.. In general the acting is good so I hope to see again these actors in some other exciting drama.