가시 (미안하다 사랑한다 OST)

Buzz were a rock band in an era when Korean drama OSTs were expected to be soft, and "가시" arrived like something rawer than the genre usually allowed. Electric guitar carries real weight here — it's not the decorative kind that pop ballads sometimes use for texture, but something that actually bites, particularly in the chorus where the arrangement opens up into full-band urgency. The vocalist, Min Kyung-hoon, has one of the more distinctive rock voices of that Korean mid-2000s moment: capable of genuine roughness at the top of his range while staying melodically precise below. He pushes toward the edge in the chorus without tipping over, which gives the song its tension. The song is about love as pain — not metaphorically, but structurally: the chorus imagery suggests that loving someone is like pressing your hand into a thorn deliberately, understanding it will draw blood and doing it anyway. Sorry, I Love You was one of the more emotionally brutal dramas of its era — it dealt with terminal illness and long-buried resentment — and "가시" captures that emotional register better than a softer track could. The bridge in particular drops to something quieter and more fractured before the final chorus hits with accumulated weight. It's the kind of song you listen to when you want emotion with some friction in it, something that earns its catharsis rather than simply offering it.