Romance:
If you are looking mainly for romance, this is not for you because some people might not like the chemistry between them. In my opinion, I like them together. They are so natural in how they show care for each other. So, I don't really mind. Additionally, if you are so focused on finding the culprit, like I was, you won't bother with them.

Culprit:
If you are looking for something unpredictable, then you might as well consider this one. This drama will make you doubt almost all the characters. This is the worst drama if you have trust issues because you will just overthink and overanalyze everything. That happened to me. However, it's a good plot twist for me. You will understand everything if you get the right answer in the end. Everything will start to make sense.

Characters:
Mr. Yoon is a very smart and reliable character in this drama. He saved a lot of people. He made everything possible. At first, I didn't think I would like his character as much as I actually did.

I didn't like Yoon Young that much in the first few episodes, but she started to grow on me. I smiled when she smiled, and I got sad when she didn't.

Soon Ae is one of my favorite characters in this show. She's just a must-protect character, and I'm willing to be one of her protectors. Her existence is already warm enough.

Baek Hee Sub is a funny guy. I laughed a lot because of him. The story of him and his brother is probably my favorite in this drama. I just love it so much.

You'll be annoyed with Dong Sik, but he'll get
major character development in the later episodes. I didn't like his character that much, but I also loved everything he did in the end.

Mi Sook is a very manipulative character. She's so mysterious. The actress did quite a good job of portraying her. I don't have a lot to say since it can be a major spoiler.

This is really good! If you like both mystery and time travel, then you will definitely like this. I also love that it doesn't only focus on mystery and science fiction but also on the families of the characters. I love the warmth of this drama. Additionally, this drama made me so curious about the serial killer. I was really hoping for the culprit plot twist part to be more mind-blowing, and it didn't disappoint me. I'll probably miss a lot of the characters in this drama. I'm kind of sad that I finished it. Highly recommended!