First the story can be shortened and more condensed. There are so many unnecessary scene, specially from the supporting characters. 26 episodes are way too much for such a simple story.
I like the young teenagers' version of the story, the lead actors are handsome and prettier compared to the cast of their older versions. Why not just use the same cast as they grew older, makeup and clothing can do the job. It is like watching two separate films, all the characters have changed, from appearance to their personality, and their height!! Cmon, the young version of Yu Jun-su is tall (at least 6") but the older version is short and not as handsome as the young actor. He was supposedly a popular boy in school. But the adult version is very reserve. The film didn't let us know why Jang Guk decided to changed her name? another loophole is the family just decided to let go of the accident that lead to the miscarriage of a pregnancy? Seriously?? and the mean girl Ju Da-hae just go on with her life as if nothing happened? I mean, she is even friends with Jun-su. what a psychopath!
The story line about Ju Da-hae's family is tiring and boring to watch.
A very subpar K drama