Though this Drama is still ongoing. I want to share my thoughts about this Drama: (HOPE THIS HELPS!)
So this is my points about the drama: (THIS MAY CHANGE DEPENDING ON THE PROGRESS OF THE DRAMA)

1. So first of all this is a fantasy, action, and mystery drama, yet it suited my taste even if I don’t usually watch these kinds of dramas.

I am a person who is more into slice of life and romance-comedy type of dramas. I only watched this for Sejeong (because I love her). But along the way, as I watched the drama, I not only fell even harder for Sejeong but I fell in love with the whole cast, the story, and the fantasy world that they live in.
I love how every episode makes me feel like I’m riding a rollercoaster. At first, I would be pumped up because of the action scenes, and the next minute I would be laughing because of the counters humor and funny scenes and then getting emotional and sad because of its family fond scenes. This drama was really well written and it balances out everything and makes you full.

2. Acting of the main leads (Kim Sejeong, Jo Byunggyu, Yu Junsang, Yeom Hyeran) as well as the support roles.

Kim Sejeong, based on what I have seen of her. She is really improving exponentially. From her first main role in School 2017 to up till now I have seen her progress. She really brings out the character Do Hana, from her bubbly personality in real life to her coldness in the drama. Also, her passion and hard work really paid off as I can see that she has done most of the action scenes which I think this shows how dedicated she is to acting. Hoping to see her on more TV shows.

Jo Byunggyu, though I haven’t seen much of his works (only sky castle). But based on what I see right now, I can see that he is an amazing actor who really has that charm of completely emerging his self to his role. I really love him as Somun! It totally fits him as the innocent and cute baby of the counters. His expressions were well executed and how he also does those stunts and action scenes which shows his dedication and hard work.

Yu Junsang, I also haven’t seen his dramas :( But I really like him here as Ga Motak. He has totally played this role really well. Junsang has really been working hard in order to match Ga motak who’s rigid in terms of physical appearance and attitude and after seeing him more in the drama... I fell in love with his character. This just goes to show how good he played his role. (PS. He's ripped yet he’s 51 years old, call that dedication!)

Yeom Hyeran, I have seen her in drama’s where she was a support role. This is the first time I saw her as a main role and I like her very much as Ms. Cho. I love her expressions when she is worried, mad, and even sad. She also has to do a lot of running in this drama and I can say that she has done a lot for her role(actions) considering that she is not young anymore. Major respect to Hyeran's passion for their action-packed drama!

Support Roles: (I can’t give critic to everyone. So I will be only discussing those people who has gotten my attention)

Lee Jiwon and Kim Eunsoo:
I really love their portrayals of desperation to save one another from those bullies in their school. I also love their cute friendship scenes with Somun (It makes you feel good and relax). All in all, I love them as Somun’s friends in the drama. They truly bring out the characters that they were given.

Jung Wongchang, Kim Yeonwoo, and Kim Yonghan:
Gotta hand it to them, they really played their roles well. I really got mad at them to the point that I want to reach out from the screen and choke them. Which is a good sign for me! (meaning that they played their roles well)

3. Music:

The background music was good. Their music for action scenes, emotional moments, happy moments, and many more. I like them all it fits right to what I want to feel.

1st OST is a rock type of music which is sung by Isaac Hong. Even if I don’t know much about this singer. After hearing the OST, I could say that he has an amazing voice. The belts that he does in the song gives you goosebumps. Also, the song really fits the genre and type of the drama.

OVERALL THOUGHT:
As of now, I am really really loving it! Each episode is like a treasure box full of different stuff in it. We get to feel a lot of emotions in just an hour. Also, I just recently finished watching Episode 6 and it was amazing again! Each episode makes me want to yearn for more!

THIS IS A HIGHLY RECOMMENDED DRAMA!!!