Han Hye Joo has a mother of a teenager is hard to believe, because she can still play student(happiness)
she look lot younger then her real age.....
After watching until EP9
no flaw at all, ever character is treated well and properly developing

After 13th episode...
Doing great with all stories, properly give Importance to every main character and there stories.
but after 7th episode we are in total blackout from present day story could have shown past lives and current side by side in every episode,
but they total focused on Past from ep 8 to 13 like they forget present
hope to see present day story from 14th episode now ...
after watching ep 15
7-14 past this was long and boring because we already know where all this character are so it was not exciting to see past for 7 hour in a 20 hour show it was 1/3 of whole show,
Now after 15 ep there is no story in this other then two school kids liking each other because of there youth and curiosity for opposite gender
this drama is good and i like it but there is no main story, Only thing that make this drama liked by many was starting of the show with kim bong seok and huisoo
this two character, there chemistry and genuine care for each other is what make people like it,
(The First Love)
showing past wasn't that wrong but 2 episode per character was two much
kim doo shik character only appeared in two episode of the drama and few scene in other episode with little screen time , but he was mentioned among Main lead actors. because he is Zo In Sung, he is supporting cast if you compare screen time with Ryu Seung Ryong or Han Hyo Joo
or it might be MDL mistake that they show Go Youn Jung , Lee Jung Ha and Kim Do Hoon at last of main lead list i mean they should be shown on top not bottom
I try to put main lead on top of list and Zo In Sung in supporting cast, hope it work