KAIROS indexes 34 years of music programming and 2,880 performers — a host's spoken query on ‘The Seasons’ pulls up a 2007 duet, with production efficiency and catalog reuse as the stated case
On the August 28 broadcast of KBS 2TV's ‘The Seasons – Sung Si-kyung's Eardrum Boyfriend’ (더 시즌즈-성시경의 고막남친), host Sung Si-kyung (성시경) issued a search command to KAIROS (카이로스), KBS's in-house AI portal, live on the program.
After introducing the system to duet guest Lena Park (박정현), he said: “KAIROS, find the Lena Park and Sung Si-kyung duet.” Up came their performance of ‘Somethin' Stupid’ from episode 268 of ‘Yoon Do-hyun's Love Letter’ (윤도현의 러브레터), aired October 19, 2007.
Sung described KAIROS on air as KBS's system holding all of the broadcaster's material in one place. Looking at the retrieved stage, one of them asked whether it had been 20 years; the correction came back that it was 19. A shared memory followed — the chairs had been so high they had looked like giants.

The KAIROS query screen as shown in the August 28 broadcast. Image: KBS 2TV YouTube capture
Natural-language queries, clip-level results
The prompt shown in the search box read: describe a scene and it retrieves the clip; ask a question and it answers with the supporting clip. The result list was headed “Scenes KAIROS found featuring Lena Park × Sung Si-kyung.”
Results included the 2007 ‘Yoon Do-hyun's Love Letter’ duet alongside ‘We Were So Good’ and ‘Quando Quando Quando’ from episode 121 of ‘Yoo Hee-yeol's Sketchbook’ (유희열의 스케치북), aired November 18, 2011. Each card carried the air date, episode number, song title and program name, with clip ranges such as 25:50–25:59 and 21:01–21:18. The unit returned is a scene, not a program — the point at which this departs from conventional archive search.