Though twist & turns are different but plot is kinda same with the ML being a special force officer & FL is a doctor. Both are of their first & last loves.

I didn't much like unstoppable youth as it looks like something is missing, ending is kind of rushed or incompleted I don't know what ?
But the concept was very likable for me . The transformation of the girl, from being under confident to being confident and national player , it was really interesting and some may not like the boy's character as he seems stiff but it was ok for me as his character was being portrayed like that only same goes for Sweet first love too
.. currently completed ep 10 , I'm loving it..do give a try . Happy watching :)