Last verified: September 23, 2026
A K-drama soundtrack rarely arrives as one finished album on premiere day.
You hear a song in an episode, search for it, and find OST Part.1. A week later there is Part.2. By the finale, the number may be in double digits.
The Part number usually marks the sequence of individual OST releases during the drama's run. Songs are released around broadcast timing, then may later be collected into a full OST album with score or instrumental tracks.
The drama creates demand before the song is released
A viewer hears thirty seconds under a confession scene and searches for the song immediately.
OST producers can release the track while the scene is still fresh. The drama promotes the singer. The singer's fanbase sends listeners back to the drama.
Releasing everything on day one would lose those weekly peaks.
Perfect Crown showed the system clearly
Kakao Entertainment's 2026 drama Perfect Crown released OST songs throughout the broadcast.
BIBI opened the series with “My Pace.” KiiiKiii, BOYNEXTDOOR, RIIZE and WOODZ followed. Byeon Woo-seok's “Fate Line” arrived as Part.11 close to the end of the drama.
Part numbers are not a ranking
Part.1 is not automatically the main theme. Part.9 is not a minor track.
A central romance song may be held until the relationship reaches the scene it was written for. A famous singer can appear late. A track already heard in the show may not be officially released until several episodes later.
The number mostly tells you when the OST release entered the rollout.
OST production can sit inside a larger entertainment company
Kakao Entertainment described Perfect Crown as an example of its integrated IP structure: drama production, music production, distribution and fan platforms can support the same title.
Other dramas use different arrangements. A production company may hire a specialist OST producer and use a separate distributor.
The Part system survives across those different company structures because it fits weekly television and streaming attention.
A full OST can arrive later
Individual Parts are made for the broadcast period.
The later soundtrack album can collect those songs and add instrumental versions, score cues or background music that was never released as a headline single.
Physical editions can also function as drama merchandise.
OST songs can outlive the drama
Some viewers remember the song long after they forget the episode number.
A successful OST can chart independently, introduce a singer to a new audience and continue streaming after the series ends.
That makes the soundtrack a separate music product, not just background audio attached to a television file.
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