Lalisa Manoban, a global megastar who performs as Lisa in the K-pop group Blackpink, tested positive for the coronavirus on Wednesday, her production company announced.The other members of Blackpink — Jennie, Jisoo and Rosé — all tested negative for the virus, the production company, YG Entertainment, said in an emailed statement on Thursday. The band’s production staff, security personnel and acquaintances have also tested negative, YG said, adding that all four members of the group had been vaccinated against Covid-19.As of Thursday morning Asia time, Ms. Manoban, 24, had not addressed her nearly 68 million Instagram followers on the positive test. But YG said she was “without symptoms and in very good condition.”A Thai-born singer and rapper, Ms. Manoban is among the most acclaimed faces of K-pop, with legions of fans. She is part of K-pop’s most globally successful all-female group, whose fame and commercial success have traveled far beyond South Korea. Five of Blackpink’s videos have been watched more than one billion times on YouTube, including 1.7 billion views for “DDU-DU DDU-DU.”Ms. Manoban’s debut solo album, “Lalisa,” was released on Sept. 10; her first single, “LALISA,” set a YouTube record for the most-viewed music video by a solo artist in 24 hours with 73.6 million views, dethroning Taylor Swift’s “ME!” in 2019.With strict limits on international travel and consistent masking, South Korea has been among the world’s most successful countries at limiting coronavirus outbreaks, reporting about 3,300 total deaths. Cases have surged to record levels in the past two weeks, reaching a new high of 4,115 new cases on Tuesday, but they have remained relatively low compared to much of the world: currently six daily cases per 100,000 people, compared with 29 in the United States, 35 in Singapore and 158 in Austria.