I've always been more interested in the Seojun side of that triangle, honestly. The friendship tension isn't just about a girl; it's about two guys whose lives were already on wildly different tracks colliding. Suho comes from this place of quiet, inherited pain and privilege, while Seojun is hustling, supporting his family, living a much grittier reality. Their bond, before Jugyeong, was probably built on a shared understanding of loneliness, but from opposite ends of the spectrum.
When the romantic element gets introduced, it exposes how fragile that understanding really was. Seojun's reactions often felt less about pure jealousy and more about this deep-seated sense of betrayal—like the one person who 'got' his struggle was also the person who had everything else, and now was taking the one thing he cared about. The story lingers on those small moments of withheld communication, the things they don't say at school, the way their mutual concern for Jugyeong forces them into a ceasefire that's incredibly tense.
What I find compelling is that the resolution isn't a neat return to best friends. The tension leaves a permanent mark, which feels honest. They move forward with a wary respect, a history between them that's been permanently altered, which is way more realistic than a lot of webtoon rivalries that just reset.