In the K-drama Twenty-Five Twenty-One, the central idea isn’t just that “life doesn’t go as planned.” What the show does more sharply than typical coming-of-age dramas is argue that timing, not love itself, is often the deciding factor in whether relationships survive, and that this applies to friendships just as much as romance. That’s a more uncomfortable but grounded perspective, because it challenges the expectation that strong emotional bonds, romantic or platonic, automatically endure if the feelings are real enough.
At first, the show feels like it’s building up to a typical happy ending, but it changes through specific turning points. Baek Yi-Jin’s life collapses during the IMF crisis, pushing him on a completely different trajectory from the others, while Hee-do is still focused on fencing and personal ambition. Early on, their late-night conversations in the tunnel feel effortless, quick jokes, overlapping dialogue, the kind of rhythm where neither of them wait for their turn to speak. Later, those same interactions feel strained as their priorities shift and carry hesitation. The shift isn’t dramatic, but it’s conversations that feel slightly out of sync. Even Hee-do’s gold medal moment, something that should unify everyone, lands differently. Instead of a shared celebration, things get quite almost distant, showing how far apart their lives have become as Yi-Jin’s career begins to take off.
The friendships change just as significantly as their friends Moon Ji-woong and Ji Seung-wan start with a strong, almost effortless bond, but their paths diverge as they face different responsibilities and personal struggles. Seung-wan’s decision to stand up to an authority at school and leave that environment marks a shift not just in her life, but in how she connects with the group. What once felt like constant closeness starts to show small fractures: fewer shared moments, slightly awkward reunions, conversations that don’t quite pick up where they left off. The show avoids exaggerated conflict and instead focuses on how distance and time quietly reshape relationships until they no longer work the same way.
It’s not just about their relationship either. All the characters experience this in some way. The use of time jumps, especially the framing device of Hee-do’s daughter reading her diary created a constant contrast between youthful certainty and adult reality. The writing builds parallel arcs: as Hee-do finds stability in her career, Yi-jin becomes more consumed by his, and their growth falls out of sync. The same pattern applies to the friend group, the future they imagined when they were younger doesn’t exactly happen, and they have to adjust. This structural choice reinforces the idea that growing up often means outgrowing certain relationships, even when nothing “goes wrong”.
Twenty five Twenty one doesn’t end with a big wedding or “happily ever after,” and that’s kind of the point. Instead, it leaves us with the image of Hee-do looking back at that old tunnel from her teen years and remembering the beach trip she and her friends went on in high school. It’s bittersweet because even though she and Yi-jin didn’t end up together and the group eventually drifted apart, you can tell those times they spent together made her into who she is. It’s not a sad ending, really it’s just a real one. It’s about that one summer that changes everything, even if you eventually have to leave it behind.
