Despite the disappointing non-disclosure in the plot and questionable change of the main leads' characters/personalities in about the last two episodes through the conflicts that arised, I genuinely enjoyed this kdrama a lot. Some may have strong opinions on the ending, and even though yes it mostly made the present scenes useless, the story really was about the youth and the relationship development with Heedo and Yijin as they grow up, so personally it didn’t ruin the show that much for me. I really can't hate it because of the deep connection I felt with the characters as I was watching, I really felt like I was growing up with them. I'm not a very emotional person, but this drama brought a lot of this out of me. Whether it was the nostalgia, relating to certain moments, or anything of that sort, the show will remain close to my heart. I'd actually like to consider it one of my top favorite kdramas- alongside Reply 1988 which made me very emotional too so I guess yall see the pattern of what I like lol. Other than the plot, everything else was really a work of art. The actors/casting were AMAZING, I loved them all so much and you could tell they formed a nice strong bond together which made the chemistry that much better. The cinematography and flashbacks in time added a lot into that nostalgic mood that I love and the sceneries are beautiful. Lastly, HUGE PRAISE TO THE SOUNDTRACKS!! I LOVEDDD all the soundtracks so so much, I really have no words for them. (Faves were Wonstein's, Bibi's, and Dk's of Seventeen osts.) I find myself forgetting a lot of soundtracks from kdramas or at least not focusing enough on them, but 25 21 allowed me to multitask in that while genuinely enjoying the songs and making them unforgettable. In regards, to rewatching value, I will admit if we actually had a better disclosure then the rating would have been way higher. In conclusion, the plot could have really been fixed but everything else being incredible owns up to those mistakes for me and I truly enjoyed it. If you're still reading, thank you so much for your time. <3 (ps. Plz be kind to me this is my first actual review here :') )