Perfect Crown (Original Soundtrack) Pt. 2 Single

Perfect Crown (Original Soundtrack) Pt. 2 is an OST single by KiiiKiii, released on 2026-04-11. The domestic title of the work is 21st Century Grand Duchess, and both titles are used together in the official MV. The tracks included are Go On and Go On (Instrumental). This is an OST release, different from KiiiKiii's EPs, and the "Part. 2" designation does not refer to a drama episode number or the group's second album.

OST Single Featuring Go On

If you first encountered the song through one or two videos, check the list of releases by unit. Knowing which songs are grouped in the same work makes it easier to choose what to listen to next. The date is the audio release date, not the performance or video filming date.

Track Order

The tracklist follows the original order of the release. It may differ from the popularity or upload order in video search results. When choosing a song title, also check the album title and version notation. While MV, broadcast stage, and official audio of the same song may exist as multiple videos, the number of tracks is different from the number of videos.

Distinguishing Vocal and Instrumental Versions

Try listening to the first track, Go On, and then continuing with the second, Instrumental. After familiarizing yourself with the melody in the vocal track, it's easier to shift your attention to the sounds behind the voice when listening to the instrumental version. The inclusion of two tracks together does not mean they are two new songs with different titles. When looking for a version without vocals, check for the "Instrumental" notation in parentheses.

Rather than trying to memorize the characteristics of all tracks from the beginning, we recommend listening through once to follow the flow, and then revisiting the parts that left an impression. Separating and recording the images that come to mind from the title and the impressions felt while listening to the actual music can also be helpful when comparing with other releases.

Enjoying Drama Videos and Songs Separately

The 1theK official MV displays Go On and the drama title together. If you first familiarize yourself with the song through the audio and then watch the video, you can observe how the video scenes influence your impression of the music. Conversely, if you discovered the song through the drama, try listening to the entire song without the scenes. Even if you remember it as an insert song for a specific scene or episode, the length used in that scene and the full song's composition may differ.

When comparing songs, it's convenient to note down both the version name and the release. Even if the title is the same, it might be a remix or instrumental version, and conversely, the same song might be included again even if the releases are different. Deciding whether you want the original song, a different arrangement, or a stage from a specific broadcast can help you find the desired material faster.

Continuing to Member Stages

After familiarizing yourself with the song, you can watch introductions and fancams of LEESOL · SUI · JIYU · HAUM · KYA. The audio is good for the overall sound of one song, group stages for the five members' arrangement, and individual fancams for following one person's continuous movements. Rather than assuming there are individual fancams for all tracks, first check the song titles of the released videos.

To compare videos of the same song, one method is to first choose two videos with the same broadcast date and program. Since the outfits and stage environment haven't changed, it's easy to see the differences in what the camera follows. Later, expanding the scope to stages from different dates can reduce judging a member's expression solely based on what was captured in a single filming.

Next Works to Listen To and Sources

At KiiiKiii Music, you can find the pre-release I DO ME, three EPs, DANCING ALONE original/remix, To Me From Me, and the OST containing Go On, in order of release. If you need character introductions first, check the names and basic information of the five members in the KiiiKiii Group Guide.

Release date, format, tracks, and length are organized based on this release page on Apple Music. The listening order is a suggested method based on work information and is not a fixed listening rule. The list was last checked on 2026-10-09.