This series truly encapsulates what youth (mostly) and what after-youth is all about! Even if you're not familiar with many of the references (personally I came to appreciate many of the series/songs that I didn't know of after looking them up) there's no way you haven't felt, even once, what any of the characters went through. Watching the first episode and seeing Shi-Won freaking out because of the videotape and her reaction, you will definitely go "yes! this is how I reacted to this/that in my past!" All the characters are very likeable and this is a big plus; the more the likeable characters there are, the more you will like the drama and it doesn't let you down in that deparmtent at all. The parents were also a joy to watch. The dialogues are witty and funny, there are a few messages that really tie up nicely with the storylines unfolding, the OST is amazing and very well picked for every occasion, the acting was great..yep, it was a truly great series, no complain that I can think of. The title is very fitting- as time goes on, it's even more difficult to sit down and remember certain moments and feelings from the past but from time to time, your own heart replies to you even if you don't ask it and the memories come rushing in! I definitely recommend it and I'm off to watch its counterpart right now. Watch it and find your own answer(s)!