This story, about two 30 year olds that are basically stuck being their teenage selves due to a tragic event, takes its sweet time setting itself up. The first episode or two are great. Lots of color as SeoRi walks down the street, with musical notes and steps lighting up. We get to see that WooJin has a crush on her. And then the accident happens and everything basically comes to a halt. This has both positive and negative aspects.

On the positive side, the characters feel very comfortable with each other toward the end of the series. This is true for our main couple SeoRi and WooJin, but also for Chan Chan, Jennifer, and even the two hilarious side kicks of Chan DoHyun and HyunShick (who IS in fact SO much older than the other two). The negative side of of the pacing was that it was just too slow at times for me, and I found myself skipping forward quite a bit, something that I rarely do in dramas. Only around episode 18 things really started picking up. It was very back-loaded in terms of events and revelations.

Despite needing to fast forward due to pacing in the beginning of the drama, the casting was superb. I started watching specifically because Shin Hye Sun is possibly my new favorite actress after Mr. Queen, and she did not disappoint here acting as a 17 year old in a 30 year old body, trying to grow as quickly as possible. Yang Se Jong's character was unbearable for only the first ten episodes due to the writing not the acting- the extent to which they made the ML fully disassociated and apathetic was too extreme for me, but 10 and on, you really got to see him change and grow. Ahn Hyo Seop was a giddy child throughout "DON'T THINK! FIL!" I also loved both of the young versions of the ML and FL. Even for characters that I disliked, like Jennifer, it was due to writing, not acting.

The biggest issue I take with this drama is the number of coincidences. Off the top of my head:
- The leads both noticed and liked each other as kids, without having met.
- After waking up and running away from the hospital, SeoRi meets WooJin twice as "Pervert" and "Poop Pants".
- WooJin's parents happened to buy SeoRi's old house.
- WooJin just happened to start inhabiting that house again, because Chan's parents just left for Africa.
- Jennifer just happened to be the maid of HyungTae, SeoRi's friend.

One coincidence, two maybe, would have been fine. But when the writers throw these many at the watcher, it is a very lazy way to try and create shock. I likely wouldn't watch it again, but it was enjoyable enough.