This is such a light, positive drama - even the negative characters don't remain so for long, everyone is good! (rare in recent dramas) or at least has a good side worth appreciating.
The casting is great. I began watching because I was curious to see the moment when a 30 year old wakes to realize their age while feeling like a 17 year old + I admire the actress. I continued watching for everyone's acting + the positive vibe of the drama.
Even though the plot continuously teased on disclosing the suspense for our main characters, I didn't mind due to the positives.
And when finally the main leads discovered what was going on, it happened all too soon - everyone adapted fast, understood eachother quickly, accepted their reality quickly etc. This felt unreal. But again, I didn't mind. It was coming to an end.
I liked the end takeaway - choose what makes you happy, you don't have to achieve your goal the fastest, just happily at your own pace. As long as you're happy & doing what you love, you'll be aligned with yourself & likely, win. The journey matters.