Kim Won-joo's New Ballad Hits 'Love Prescription' Fans Differently

When Kim Won-joo (2F) added her voice to the sixth OST track from KBS2's hit weekend drama Love Prescription (사랑을 처방해 드립니다), she delivered something that felt less like a scheduled release and more like an emotional landmark. Released on April 12, 2026, the ballad "Only You" (그대뿐이죠) has resonated so deeply with viewers that the official lyric video was quickly turned into a one-hour loop on Stone Music Entertainment's YouTube channel — a telling sign of how completely the song has captured fans' hearts.

From the opening notes, "Only You" establishes itself as a piece of music that earns its place in the drama's emotional arc. In a crowded landscape of K-drama OSTs, it stands out not just for its technical polish but for the raw sincerity Kim Won-joo brings to every phrase. The song captures the particular ache of loving someone when time feels suspended, and it does so with a restraint that makes it even more devastating.

A Ballad Built for Longing

At its core, "Only You" is a song about waiting. The lyrics speak to the experience of loving someone so completely that even the passage of time feels irrelevant — "You are the only one in this world; today as I dream of you, I can smile; every day shone, every day was precious." It is the kind of language that feels both universal and deeply personal, perfectly suited to the slow burn of Love Prescription's emotional themes.

Musically, the track is built around Kim Won-joo's strengths. A melody that evolves alongside the emotional weight of the lyrics, rich instrumentation that swells at precisely the right moments, and a vocal performance that moves between restraint and release with striking control — all of it designed to hit the listener in a specific, targeted way. The result is a song that does not merely accompany the drama but explains it, giving shape to feelings the story has been building toward.

The one-hour loop version on Stone Music Entertainment's official channel attracted significant engagement almost immediately after upload. That kind of repeat listening is rarely accidental. It reflects a track that delivers the same emotional payload every single time it plays — the mark of a truly well-constructed ballad.

The Voice Behind the Track

Kim Won-joo, known professionally as 2F, has built a career on the kind of vocals that make a drama OST feel inevitable — as if no other voice could have carried that particular song. Her ability to express layered emotion without overselling a single note has made her a sought-after presence in Korean drama soundtracks, and "Only You" is a showcase for exactly that talent.

Where lesser ballads can slide into generic sadness or generic romance, Kim Won-joo locates the specificity in the feeling. On this track, she navigates the subtle distinction between longing and acceptance — the kind of love that does not demand its subject return, only that the memory stays lit. It is a sophisticated emotional register, and she inhabits it without apparent effort.

Her casting for Part 6 of the Love Prescription OST series feels deliberate in its timing. By the sixth installment of any drama soundtrack, the characters' relationships have deepened into real complexity, and the show needs a voice that can honor that weight. Kim Won-joo's arrival at this stage of the OST series is exactly right.

The Drama Behind the Music

Love Prescription airs on KBS2 every Saturday and Sunday at 8 PM, occupying the network's flagship weekend drama slot. The show follows two families bound together by thirty years of grudge, misunderstanding, and accumulated pain — and the long, difficult process of finally clearing that history and becoming something like one family.

It is a format that Korean weekend dramas have perfected over decades: the careful excavation of generational wounds, the unexpected warmth that emerges once old defenses come down. Love Prescription has found its audience precisely because it understands that emotional complexity, and its OST series has consistently matched the drama's tone across every installment.

By the time "Only You" arrives as Part 6, viewers have already traveled a significant emotional distance with these characters. The song functions as both a reflection on that journey and a quiet promise of the resolution still ahead — giving longtime viewers a musical anchor and newcomers a clear sense of the show's emotional stakes.

An OST Series With Legendary Pedigree

The entire Love Prescription soundtrack carries the creative oversight of Song Dong-woon, one of South Korea's most celebrated drama OST producers. His resume reads as a catalogue of Korean television milestones: Goblin, Hotel Del Luna, Descendants of the Sun, It's Okay, That's Love, Moon Lovers: Scarlet Heart Ryeo, Our Blues. The tracks he produced for Goblin alone — "First Snow," "Stay With Me," "Beautiful," "I Miss You" — became embedded in the collective memory of Korean drama fans worldwide.

Collaborating with a producer of Song Dong-woon's caliber means every element of the OST — the casting of vocalists, the emotional mapping of each track, the way the music evolves alongside the narrative — is handled with the full weight of the drama's arc in mind. For Kim Won-joo, that means her performance on "Only You" has been framed and supported to hit as hard as the song's potential allows.

Song Dong-woon's consistent presence across multiple generations of beloved dramas also carries a built-in cultural signal. Viewers who grew up with his Goblin or Descendants of the Sun soundtracks know, even before they press play, that the music is going to mean something. That expectation has been met with "Only You."

Why Listeners Can't Stop Replaying It

In the streaming era, a drama OST that generates hour-long loop versions is making an unusual argument: that there is a portion of the audience that wants to stay inside this particular emotional space for as long as possible. Most content fights for fragmented attention. "Only You" is asking listeners to commit, and they are saying yes.

Part of that appeal is contextual — viewers who have followed Love Prescription through multiple episodes bring the entire weight of the drama's narrative to every listen. But the song also works for first-time listeners who come in cold. It does not require the drama as a prerequisite; it is strong enough to stand alone as a portrait of a specific kind of love.

Fan communities have shared the track widely since its April 12 release, with listeners describing it as capturing exactly the feeling the drama has been moving toward. In an OST landscape where many tracks function as atmospheric filler, Kim Won-joo's "Only You" insists on being heard — and, judging by the loop count, insists on being heard again.

As Love Prescription continues its Saturday-Sunday run on KBS2, the sixth OST track has given both the drama's loyal viewers and new listeners something to return to: a ballad about the endurance of love that has, so far, proven its own staying power.