The Good:
⌲ The cute second couple
⌲ The lack of love triangles
⌲ There are very few annoying things. (unfortunately the same is also true for excitement)
⌲ The beautiful people, everywhere
⌲ It's not very long & as such the pace is rather good until e12.

The Average:
⌲ The mediocre acting
⌲ The mediocre chemistry
⌲ The super shallow romance
⌲ The villains were meh.

The Bad:
⌲ The time travel plot is far below average, it's just really on the boring side & there is even less logic than usual in this genre.
⌲ The lack of comedy is a big problem, since there is no other hook for the romance to remain interesting.
⌲ Even for a low intensity cdrama this one is just lifeless
⌲ The ending follows a basic time travel drama cliche & I don't like this type of happy ending at all.
⌲ There is very little thrilling for a supposed thriller.