I felt tbis drama could of have a lot of potential. The summary sounded really good but in reality it was just lacking...
1) I thought , cool time traveling ... but the story I feel gets sucks for most of the drama and its only 24 episode..

It just mostly focused on when the male lead travel back in time to save the female lead... I didn't really feel the chemistry between the female and male lead. . ( if you want to see a school drama/ good chemistry between the lead i highly recommend the best if you in my mind) There isnt any kissing expect a peck on the cheek ( lol in last ep)

The story just felt like it was stuck on everyday school, which leaded up to the day the female lead was "supposedly going to die" . It really only picked up at the last few episodes. They make it so mysterious as how she was supposed to be dead.... The thing with her best friend traveling back in time to save her??? .....

Towards the end i was touched by what the male lead did ( wont spoil anymore )

I loved the ending song!!!

I would only watch if you have a lot of time of your hand... but i definitely would not rewatch. I almost dropped the drama because it was going too slow.....