Ailee scores the first No. 1 of her career this week as her latest single, "U&I," ascends 3-1 on the GAON digital chart. The brassy track, which is reminiscent of the music of Amerie and Beyonce, has been at the top of all the major real-time charts since its release two weeks ago, and still shows no signs of slowing down despite a slew of new releases from top-tier acts.

Last week's chart-topper, 2NE1's "Falling In Love," drops a massive six spots in its second week, despite heavy promotion from the popular group on music programs and variety shows. On the bright side, the song is holding up relatively well in the top ten of most real-time digital charts, so it could still stick around for a while on GAON.

2NE1's labelmate, Kang Seung Yoon, debuts at No. 2 with his new single, "It Rains," narrowly missing out on bagging his second No. 1 hit.

One spot lower is INFINITE, who enter at No. 3 with "Destiny." The song ties "Paradise" as the group's highest-charting single to date.

A Pink's "NONONO" slips two places from last week to No. 5. The song has been selling incredibly well since the group won first place on Show Champion and Music Bank last week, so it'll likely rise again or maintain a similar position on next week's chart.

B2ST's brand new single, "Shadow," debuts at a disappointing No. 12. Unless it rises next week, it'll be their lowest-charting title track since they debuted back in 2009.

Meanwhile, Junsu's latest solo effort, "Incredible," arrives at No. 14, which isn't too bad by his standards.

However, the best news of the week belongs to Crayon Pop's "Bar Bar Bar," which continues its ascent up the charts by jumping 36 spots to No. 18. Sales of the sleeper hit have been consistently rising for weeks now, and there's a big chance that "Bar Bar Bar" will reach yet another new peak on next week's chart. There hasn't been a song in K-pop for years that's experienced this kind of slow-burning success, and if it keeps growing like it is now, there's a chance that "Bar Bar Bar" could turn into a national craze.

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

No. 1. Ailee - U&I

No. 3. INFINITE - Destiny

No. 12. B2ST - Shadow

No. 14. Junsu - Incredible

No. 18. Crayon Pop - Bar Bar Bar