IU's Collaboration Single with Bangtan Boys' Suga Sweeps Music Charts

"Eight," the new single by singer IU and Suga, a member of boy band Bangtan Boys, also known as BTS, swept many global music charts shortly after its release on Wednesday.

"Eight" reached No. 1 on major music-streaming sites here including Melon. It also topped iTunes charts in some 59 countries.

The massive response was anticipated even before the release, as the top two stars, who are the same age in their late 20s, worked together on writing, composing and recording the song, sharing their thoughts and feelings.

On her social networking account, IU explained earlier that the song is like "a short story which metaphorically reflects" on her life.

"It worked like a charm. Everything went smoothly without a lot of back-and-forth," said Suga in a recent podcast.