Despite strong competition, Ailee, has managed to log a second consecutive week at the top of the Gaon chart with her sassy new single, "U&I." The song has already won first place on Show Champion and Music Bank, and even now, is still in the top three of both the Melon real-time chart and instiz iChart. If sales continue to be as strong as they are now, there's no doubt that "U&I" will close out 2013 as one of the biggest K-pop songs of the year.

Right behind Ailee is B2ST, who shoot up ten spots to No. 2 with "Shadow." After the song debuted at a disappointing No. 12 last week, we warned that the boys would need to rise higher to stop "Shadow" becoming their lowest-charting lead single to date: Not only did B2ST do that, but they've exceeded our expectations by reaching as high as No. 2, which is even higher than "Fiction" and "Beautiful Night" peaked at.

In third place is A Pink with "NoNoNo," which bounces back to No. 3 after dipping two spots last week. "NoNoNo" has been huge for the rookie girl group so far and is still showing a lot of longevity on the charts. It's success has definitely established A Pink as major players on the girl group scene.

INFINITE's "Destiny" falls just one spot to No. 4 this week, while the sagging sales of 2NE1's "Falling In Love" have now stabilized as the song spends a second week at No. 6.

Meanwhile, the popularity of Crayon Pop's "Bar Bar Bar" continues to skyrocket, as the song shoots up ten spots to No. 8. The kind of late blooming success that "Bar Bar Bar" is having is virtually unprecedented for K-pop, and it's set to climb even higher on next week's chart. Could "Bar Bar Bar" be the new "Tell Me," "Mister," or "Abracadabra"?

New debuts for the week include Kim Hyung Yoong's "Your Story" at No. 15, Koyote's "Hollywood" at No. 32, Lee Jung Hyun's horror-pop single, "V," at No. 36, AOA Black's "Moya" at No. 68, and TAHITI's "Love Sick" at No. 93 AOA will probably rise next week, so don't be too disappointed with their lowly debut just yet!

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

No. 1. Ailee - U&I

No. 2. B2ST - Shadow

No. 8. Crayon Pop - Bar Bar Bar

No. 15. Kim Hyung Joong - Your Story

No. 36. Lee Jung Hyun - V