I love all the leads to be honest, and I often found that HJ was always more mature than both JJ and SO, He just never knew how to be as honest about his feeling like SO. SO is such an interesting character in general, because he was always so honest about how he felt abut JJ and HY, so it was heart breaking to see his his pain in season 1. ( • ө • )♡

Season 2 was so much better than season 1 as it kept me utterly hooked, and the growth each and every character including JJ's cousin and Aunt, had was beautiful. Season 2 also showed the major wounds both HY and So had due to their families and it was so beautifully portrayed. I almost cried when I found out the reason why HY always smiled in the mirror.
Now lets talk about the secondary plot lines. T be honest, they were not all that interesting, I barely even remember anything to do with JJ's friend. Also, the creepy stalker's story was just plain weird. However my favourite side story was that showing the cousins growth, because I think the writer kept her full of flaws and didn't water down her personality like they do to many feisty female characters in dramas. She grew enough to understand JJ and not bully her, while also caring about her mom's life as well, which was sweet.

Back to the Main couple. I was very happy with the ending as both characters helped each other grow and was their for support, and at the end I can't say anyone was lonely. My favourite side character was definitely Duk gu, he is genuinely such a sweet heart and I also loved Gul Mi too . ʕ •ᴥ•ʔ