. . "B1A4"@en . "2011Z"^^ . . . . . . . . . "B1A4 (Korean: \uBE44\uC6D0\uC5D0\uC774\uD3EC) is a South Korean idol group under the management of WM Entertainment. The group debuted in April 23, 2011 with the single \"O.K\" after their first introduction to the public through a webtoon."@en . "group_or_band" . . .