I'm going to be brief. Most of "time travel" related dramas are mess but this was pretty ok. Ok. Not perfect. It had few holes and the end was meh(=the last 2 minutes)

The acting was brilliant. I was sometimes scared how good it was. It felt too real watching jong-seo, thumbs up for both FL<3

Start was slower but it was bearable and i was nervously bitting my nails through the last 50 minutes,not gonna lie. The thrill was real. Definitely worth watch for people who like thrillers and psychology etc. but sometimes it's better to switch your brain off and just watch.