Sanmanhan Releases 'Striped sweater' OST

Folk duo Sanmanhan has added a tactile, intimate sound to the KBS2 weekend miniseries Not You, Another Romance with “Striped sweater,” the drama’s third original soundtrack release. The song arrived on October 4 at 6 p.m. KST, and its official music video is featured on 1theK, the K-pop distribution channel operated as an official home for music videos.

“Striped sweater” is built around the feeling of a long relationship remembered through ordinary things. Starnews reported that the song is tied to the drama’s ten-year couple, whose familiar relationship is unsettled by new emotions. That premise gives the track a specific emotional job: it must make time feel present without turning the relationship into a grand spectacle.

A Third OST With a Deliberately Close Sound

The arrangement begins with classical guitar and adds flute, clarinet and acoustic bass. The combination keeps the sound grounded in acoustic color, while the individual instruments create room around the vocal line. It is a useful match for a story about an established couple, because the music can suggest shared history through texture rather than relying on an oversized dramatic peak.

Sanmanhan took responsibility for much of that texture. The duo handled the vocals and production, and Starnews also credits them with the lyrics, composition, arrangement and classical-guitar performance. That level of participation means “Striped sweater” is not simply a vocal appearance placed over a commissioned backing track. It is a Sanmanhan interpretation of the drama’s emotional world.

The song’s title supplies its most direct image. A striped sweater is an everyday object, something that can hold memory precisely because it is familiar. Starnews described the song as looking at an old sweater and recalling a person with whom time has been shared. The idea keeps the emotion concrete: a relationship is represented through an item that can be seen, worn and remembered.

Connecting Music to a Ten-Year Romance

Not You, Another Romance is described as a realistic romance about partners who have been together for ten years and suddenly face feelings that no longer fit their established routine. Seo Kang-joon plays Namgung-ho, an employee at Hunmin Confectionery who is willing to do anything for his partner, while Ahn Eun-jin plays filmmaker Imi-do, a director who refuses to give up on her dream despite the limits of reality.

The character descriptions in Starnews’s report clarify why the OST is centered on familiarity rather than novelty. The drama’s conflict is not introduced as a first meeting. It comes from the difficulty of seeing a long-known person differently. “Striped sweater” can therefore function as an emotional bridge between the couple’s past and the questions raised by the present.

The arrangement supports that bridge through restraint. Classical guitar gives the song a folk foundation, while flute and clarinet add air and acoustic bass adds weight beneath it. This is an interpretation of the reported instrumentation, not a claim about chart performance or audience response. Its importance lies in how the sound reflects the drama’s stated focus on accumulated time and changing feeling.

The official MV on 1theK extends that release context. Featured on the channel’s K-pop Wonderland platform, the video places “Striped sweater” within the normal ecosystem of official music distribution. 1theK says its uploaded MVs are counted for music-show views, giving the video a formal role beyond simple discovery.

Sanmanhan’s Own Musical Identity

The OST also arrives with a clear sense of the duo’s background. Starnews reported that Sanmanhan is a team that began through documentary production and later pursued music that can continue beyond the screen. That origin matters for a drama soundtrack: the duo’s work is presented as a way of extending the feeling of a filmed story rather than merely decorating a scene.

Their recognition at the 2024 Korean Music Awards, where they won Best New Artist at the 2024 Korean Music Awards, Starnews reported, gives additional context to the collaboration. The award does not predict how “Striped sweater” will perform, but it identifies the duo as artists with an established point of view. Their participation in every major songwriting and arrangement role makes the OST a natural continuation of that identity.

Sanmanhan have also been described as performers who can meet audiences with two acoustic guitars and their voices. That setup is echoed by the new song’s classical-guitar center, even as the flute, clarinet and bass broaden the palette for television. The result is a release that remains connected to the duo’s folk character while serving the needs of a serialized romance.

Why the MV Matters in the Drama Rollout

As OST Part 3, “Striped sweater” enters the drama after its musical world has already begun to take shape. A third soundtrack song has to do more than announce a series; it must deepen the emotional vocabulary viewers associate with the characters. The song’s emphasis on an old object, a ten-year history and the warmth of an accustomed relationship gives it a focused place in that sequence.

The track also creates a point of entry for listeners who may not yet know the series. They can encounter Sanmanhan through the official 1theK MV, recognize the acoustic instrumentation and then discover the drama context behind the song. Conversely, viewers following the couple can hear a familiar part of their story expressed through a separate musical form.

No chart figures, streaming totals or quoted listener reactions are included in the verified material for this report. The release can be assessed on the facts available: it is a new OST, it was released on October 4, Sanmanhan led its creative production, and its instrumental design is aligned with a drama about long familiarity meeting unfamiliar emotion.

“Striped sweater” ultimately works through small details. The title turns clothing into memory, the acoustic arrangement keeps the feeling close, and Sanmanhan’s hands-on production connects the song to their own folk practice. With its official MV now available through 1theK, the OST gives Not You, Another Romance another way to make a ten-year relationship audible—one instrument, object and remembered feeling at a time.