Korean idols are looming large on the Billboard World Albums Chart of hits outside North America and the U.K., with four topping it in the past two months alone.

On the March 2 chart released on Friday, B.A.P took the No. 1 spot with mini album "One Shot." The feat came as a surprise even to the group's agency, as the stars made their debut together only one year ago and have yet to gain a solid recognition even at home.

Previously, Girls' Generation topped the Jan. 19 chart; Super Junior M, an offshoot of Super Junior for Chinese-speaking countries, the Jan. 26 chart; and CN Blue the Feb. 2 chart. On the Feb. 9 chart, JYJ's Kim Jae-joong came in second place.

Korean idol singers are getting fans overseas even without extensive promotional activities, industry insiders said. "It's important to present their uniqueness and make serious efforts with varied songs," one noted.

Girls' Generation's "I Got a Boy" broke the typical K-pop mold -- even feeling a bit strange to some K-pop listeners. Billboard described it as "one of the most-forward thinking lead pop singles heard in any country."

Members of Super Junior M set themselves apart by singing in Chinese, while B.A.P have talent in hip-hop and rap.