An all-kill (올킬) is a song reaching No. 1 on the main Korean music charts at the same time. Soompi, quoting how iChart awards it, describes a certified all-kill as No. 1 on the daily and Top 100 charts of Melon, the daily and realtime charts of Genie and Bugs, YouTube Music's Top Songs chart, VIBE's daily chart, and the realtime charts of FLO and iChart.12
Perfect
What makes it "perfect"
A perfect all-kill (퍼펙트 올킬, PAK) means the song has also topped iChart's weekly chart.12 Wikipedia's wording is shorter: a song is a PAK when it is at No. 1 on the real-time, daily and weekly components of iChart at once.3 The term was first used when IU's "Nagging" topped all the Korean charts in June 2010; iChart launched in March 2010 but lists no 2010 records.3 iChart announces them itself: both Soompi reports quote its posts on X, timed 12:30 p.m. KST.12
iChart is run by Instiz, the South Korean web publisher that also operates the Instiz forum, and describes itself as an integrated chart of online music rankings.34 Wikipedia says it gathers the real-time, daily and weekly rankings of Melon, Genie, Bugs!, VIBE, FLO and YouTube Music and produces its own real-time and weekly rankings from points given to songs; the point weights it lists carry a "citation needed" tag there, so DabPop doesn't repeat them.3 A PAK is therefore a streaming-chart feat, not a sales or Circle Chart one.3
Tiers
Real-time, certified and perfect
Wikipedia lists the tiers below a PAK: a real-time all-kill (RAK) is No. 1 on all iChart real-time charts, and a certified all-kill (CAK) is No. 1 on all real-time and daily charts; a PAK also needs the weekly chart.3 Soompi's description of a CAK instead names the individual services' charts, as quoted above, so the exact list is worth checking against iChart's own announcement for any one song.12
Rules
Why the rules keep changing
The set of services has changed. Wikipedia says that before 2015 iChart used ten providers, that in February 2017 the major distributors changed their real-time calculation to the hours between 12 p.m. and 6 p.m., so a release outside that window counted only from 1 p.m. the next day, and that FLO was added in February 2019 and Mnet's service merged into Genie in October 2019. In May 2020 Melon changed its real-time chart to count unique listeners over the last 24 hours rather than hourly usage.3
Hours
Counting hours at No. 1
iChart also tracks how many hours a song holds a perfect all-kill. Wikipedia's list, as of January 21, 2026, puts "Golden" by HUNTR/X (Ejae, Audrey Nuna and Rei Ami) first with 1,484 hours, then Hwasa's "Good Goodbye" with 750, the most for a solo act, NewJeans' "Ditto" with 655 and BTS's "Dynamite" with 610.3 Soompi reported on July 14, 2025 that "Golden" had become the third PAK of that year, after IVE's "REBEL HEART" and G-Dragon's "TOO BAD" (featuring Anderson .Paak).2 For how the soundtrack climbed other charts, see How KPop Demon Hunters Sent K-Pop Up the Global Charts. Videos: G-DRAGON - TOO BAD (feat. Anderson .Paak) (Official Video) (OfficialGDRAGON); “Golden” Official Lyric Video | KPop Demon Hunters | Sony Animation (Sony Pictures Animation).5
IU has 21 PAK songs on Wikipedia's list, as of May 2, 2026, including "Love Wins All"; BIGBANG has 7 and IVE 6.3 When "REBEL HEART" became IVE's fifth on February 11, 2025, Soompi called them the first girl group with five different PAK songs and the fastest act to the mark, three years and two months after debut; the only other acts with five at the time were IU and BIGBANG.1 Videos: IVE 아이브 'REBEL HEART' MV (STARSHIP); IU 'Love wins all' MV (이지금 [IU Official]).5