This is may be a cliche for some and maybe new plot for another, let me be honest, i am an addict for soaps, and since i am an experienced watcher, i have seen such drama before, but what really makes it enjoyable, re-watchable is actually the whole as a package.
Story: Although the story is a cliche for Uee, (her specialty poor and miserable then a happy ending) she always keep improving every time. The plot is well executed and well written.
Characters: All have developed, all characters had closures. except for two characters stood the same.
Plot twist: There are few plot twists along the way. it made the series freshen up when it dragged a bit.
Re-watch value: it is totally re-watchable, its one of the series that you will not bored of.
The team work of the cast is super effective for the near perfection of the series.
The music though, i thought it would be more remarkable OST, i only had one OST by heart, not all of them.
All in All, this is a very likable experience and i definitely recommended