So someone watched Tokyo Revengers, Steins;Gate, Erased and Your Name and decided to make a KDrama out of these shows and I love it. The plot sounds simple, and in a way it is simple and generic, in terms of the time travel trope. I think the brilliance lies in how this trope is executed; after all every kdrama utilizes a subset of the already established tropes and what makes the memorable ones so good is how the trope is utilized and made effective. Perfect execution with the best parts of the shows without the drawbacks of each of them. However to understand what elements of each and in what linear combination, give rise to this show, you will have to watch it for yourself!