I thought a long time what to rate it. I actually wanted to rate it 7, but then I looked at other dramas I rated a 7 and thought this doesn't deserve that rating. There are just too many flaws. Such as:

-The story has too many logical inconsitencies and makes no sense, neither time travel mechanics wise, nor characters and their motivations, nor various plot twists make sense when put together. It was clearly a story that focused on generating dramatic situations rather then being clever or well written.

-Dropped plot points that were never explained like the bald assasin from the future or why was the antagonist allowed to see the future since childhood, why did child ml know the future too etc.

-Too many over the top action scenes like FL falling down the stairway and shooting mid flight.

-Some of the ML McGyver's like shooting cola capable of knocking out soldiers (or killing them, not sure which) are implausbile too, starting from the very first airplane scene

-The antagonists are incompetent. Even considering their motives revealed in later episodes, they still do stupid shit they shouldn't have done like surrounding protagonists in a tight circle and aiming at them with guns (friendly fire guaranteed)

-The post apocalyptic future is radiocative so every time traveler is contained, but actually they don't suffer any consequence and look and live healthy. Also FL and her father walk in gas masks outside, but actually they don't need them and are fine without them too. guess the masks are just for fashion.

-The character of FL is annoying, childish, withholds information from ML for no reason and is quite dumb. Still she grew on me eventually, but she's not some cool FL like she could have been if she was written better. Also her saying to the other guy multiple times she didn't kill anyone when she killed at least several dozen people in the future is laughable.

-music was sometimes unfitting and weird

there are some good things tho, such as:

-very good color palette for most scenes, and very good direction and cinematography

-good acting from most people, esepcially from ml and the antagonist

-these two are also the most interesting characters

-the plot prioritizes drama over logic, but it does drama (and melodrama) well

also, this drama is different from many others in the sense that it starts bad and gets better in second half (and also more confusing). it took me several episodes to get invested in this story, but once I was I actually enjoyed watching it

so. I think 6.5 is a fair rating.