CODA, a word that is linked to two major topics.
While it has a place in music, where it means to conclude the song nicely, it also has a meaning in society, where it means child of a deaf.
Combining those two topics was a great idea and holds a special meaning storytelling wise.

Story:
The story itself is great and somewhat new.
The usual time travel dramas are dealing with a main lead, that is traveling back in the past to investigate, or even change their future outcome.
While this is partially true for Twinkling Watermelon too, it has more depth to it.
Ha Eun Gyeol was unintentionally sent back in time and Choi Se Kyeong got there to just have a wholesome last time.
One is trying to prevent the dad from a great misfortune, while the other is trying not to get born at all.
While both don't know why they are exactly there, their futures are more intertwined than they assume at first.
Linking light events like first love, family matters, but also deals with more in depth topics such as abuse, abandonment and many more together.

Casting:
The cast in Twinkling Watermelon is so phenomenal.
I can't think of better main roles.
Ryeoun and Choi Hyun Wook were absolutely astonishing in how they portrayed Ha Eun Gyeol and Ha Yi Chan.
Their bromance, the laughter and their relationship of friends/ father son is one of a kind.
It makes you wish to have this kind of relationship too.
Both did amazing in how they brought the complicated characters of them to life.
Seol In Ah did a fantastic job portraying Choi Se Kyeong.
Her character brought a cheerfulness and easiness into the drama.
But my highest respect goes to Shin Eun Soo who is portraying Yoon Cheong Ah.
Acting itself is hard as it is, but portraying a character, with no lines and purely throughout facial expressions and actions is top tier acting.
You could literally see the character development of Cheong Ah through the screen.
Hands down, my highest respect.

Music:
The OSTs as well as the songs played in the drama itself were nice.
"Higher" perfectly describes a spirit that is free.
Nothing can stop you, while you are trying to reach your dreams.

"Shining" is more of a motivational song.
It describes a feeling of Not giving up.
Forget about the past and start again. There are always opportunities for it.

Overall, Twinkling Watermelon is a must watch.
If you haven't seen it yet, you are missing out.
You'll feel all kinds of emotions while watching.
I caught myself cheering and even shedding tears several times.
The director did really great in directing the drama and the actors did fantastic in portraying the emotions.
Well done.