Story: It was all rainbows and unicorns (as a rom-com SHOULD be) until writer decided to go into MAKJANG territory and destroy all the hard work she put into creating this story (last minutes of ep.16 was just an ordeal to watch) The story has so much heart in the beginning, with endearing characters who despite not being blood-related helped/supported each other in difficult times, they were like the perfect family that everyone dreams of.
Chemistry between the leads was on point. They made a beautiful couple and even when Jun was revealed to be a high-schooler, I didn't mind at all (I know many people were bothered by this detail, I wasn't one of them), I stood by them and hoped for a beautiful resolution to their love story. I'm still angry at the writer for giving everyone the happy-ending they deserved except our main couple. Jun faking his own death for 5 years, him coming back into Rara's life and acting as nothing has happened was just appalling. I just can't with this one...who in their right mind thought it was a nice way to wrap up things?

Rara could have move on and been married, you know it's been 5 fuck*ng years and you expect her to welcome him open arms and to forgive him just like that *oh wait, it's exactly what happened* (she thought he was dead for God's sake!!!)
I would be furious as hell and dump him on the spot (even if the guy was the real Lee Jae Wook!)
Before leaving, he should have told her the truth. Period. Rara would have probably been devastated at first but she could have given him the emotional support he needed and they could have faced it together like real couples would do. In concealing the truth, he's showing he didn't trust her, he's treating her like a little girl.

DoDoSolSolLaLaSol's revelation was about the only good thing in the latest episodes. It was beautiful, I admit, it made my heart flutter. Knowing he fell in love at first sight and all the things he did to keep in touch with her was just so precious and romantic (he was indeed her star/guardian angel) but writer had to ruin that lovely concept with the nonsensical and outdated illness plot ughh

The best ending imho: Show started with a wedding that fell through and should have ended with our main leads wedding. Coming in full circle. Writer may have thought it was too cliché?!? Still I'd take this 'cliché' ending over the infuriating one she has given us.

Edit: Writer could have include the wedding in a last epilogue for example. Just a thought.
Finale Rating: 6.5/10 and I'm being generous (8.5 from first episode to 13)

Acting:
Top-notch acting from everyone. I was most wary of Go Ara but she pleasantly surprised me with her bubbly, fun and optimistic character.
They are the reason why I stuck with this drama till the end. They deserved better. Writer failed them big time! And she ruined LJW first leading role *angry* (writer is blacklisted from now on!!)
To think it's from the same team behind 'Shopping King Louie' which is one of my fav dramas ever *I just can't believe it*
Rating: 9.5/10

Music:
OST was nice and I quite liked it.
Rating: 8.5//10

Rewatch Value: No, I won't go through this one a second time. Drama ended when Jun crashed the fake wedding and they went to the beach.
Rating: 3.5/10

Overall: For those wondering why I'm so harsh with the writer and the drama in general...It's because it could have been a great drama, it had so much potential in the beginning and I trust the writer because I watched all her projects (there's only 2) and enjoyed them a lot. I just feel cheated in the end.
Finale Rating:7.5/10 (mainly for the actors fabulous performances)