Before sEODo BAND had much of an audience, it had a problem familiar to every new act — it needed 30 minutes of music to play at performances. The solution came from a source most rock bands would not think to raid. The band took the highlight passages of the traditional pansori "Chunhyangga," strung five of them together and found that the half-hour set told the whole story of the 18th-century Korean love epic from beginning to end. That set is now, nine years later, the band's first full-length album, "ONE," expected for release on Friday. "It turned out to be more fully realized than we expected," the band's vocalist, sEODo, said during an interview at The Korea Times headquarters in central Seoul, Aug. 3. "Making a full-length in that shape became something the band had wanted to do for years." The album's title carries more in Korean than it can in English. "ONE," or "won," means circle in Korean. It is also the "won" of resentment and of longing, the two forces driving the lovers through the "Chunhyangga" story. The plot itself loops — a couple meets, parts and meets again. It