4minute is one of K-pop's longer running girl groups having been together for five years now, but it's not until this past year that they've started charting No. 1 hits. They first achieved the feat last April with "What's Your Name?," and the girls finally strike gold again this week as their latest single, "Whatcha Doin' Today," debuts at No. 1 on the official Gaon chart.

It was a close race to the top, with only the tiniest difference between 4minute and Lim Chang-Jung's "Ordinary Song," which debuts at No. 2.

2NE1's "Come Back Home" falls to No. 3, while Soyou and JungGigo's mega-hit "Some" slips to No. 5.

Orange Caramel stays strong at No. 6 for a second week in a row, while Busker Busker's two-year-old hit, "Cherry Blossom Ending," continues its rise back up the charts by climbing to No. 10.

AOA's "Miniskirt" is still in the top thirty after two and a half months, this week sitting at No. 28.

Ga-In's new single, "A Tempo," enters at No. 22, while rookie boy band TROY rocket 75 spots to No. 32 with "Green Light."

The most interesting entry on the charts this week belongs to Lee Michelle, who crashes and burns at No. 142 with her debut single, "Without You." Michelle first rose to fame on season 1 of reality TV singing contest, K-pop Star, which landed her a record deal with YG Entertainment. She was supposed to debut in YG's then highly-publicized girl group, SuPearls, but after almost two years of training, the group was disbanded and Michelle was dropped. Considering how much controversy the disbandment caused at the time, you'd think her long-awaited solo debut would've been a big hit. "Without You" has since fallen out of Melon's top 100 and the instiz iChart, so the chances of it climbing any higher next week are slim to none.

Anyway, check out this week's key K-pop hits below!

No. 1. 4minute - Whatcha Doin' Today

No. 6. Orange Caramel - Catallena

No. 22. Ga-In - A Tempo

No. 43. TROY - Green Light

No. 142. Lee Michelle - Without You

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Former Wonder Girl Sunmi scores her second solo hit this week, debuting at an impressive No. 2 with her new single "Full Moon."

It's Sunmi's second time at No. 2; her first was her debut single "24 Hours," which narrowly missed out on the top spot last year.

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Sitting at No. 1 for another week is SISTAR's Soyou with her Junggigo duet, "Some," which has been so successful that it's already picked up six wins on Korea's main music programs.

Veteran K-diva Park Ji Yoon debuts at No. 12 with "Beep," while her other new single, "Inner Space," enters at the much lower 122.

As we predicted last week, Ladies' Code's "So Wonderful" has raced up the charts, shooting 19 spots to No. 14. It's now the second-highest charting song of the group's career, just behind "Hate You" which briefly peaked at No. 13.

AOA's "Miniskirt" and Girl's Day's "Something" both continue to show crazy longevity on the charts, sitting at No. 16 and No. 17 respectively, while Ga-In's "Truth Or Dare" falls to No. 20.

STELLAR stays on the move with their controversial new single "Marionette," which gives the girl group their first ever top forty hit this week by raising seven spots to No. 35.

Meanwhile, T-ara's special collaboration single with Cho Young-soo, "First Love," debuts at a disappointing No. 47, but could possibly rise a bit next week. After School's own special collaboration single, "Week" with Brave Brothers, enters one spot lower at No. 48.

Check out this week's key new K-pop hits below!

No. 2. Sunmi - Full Moon

No. 12. Park Ji Yoon - Beep

No. 14. Ladies' Code - So Wonderful

No. 35. STELLAR - Marionette

No. 47. T-ara - First Love