I.O.I, a popular South Korean girl group, has successfully concluded their 10th-anniversary concert in Seoul. The group, which consists of 9 members, including Lim Na-young, Chungha, Kim Se-jeong, and Jeon So-mi, performed at the Jamsil Indoor Stadium from May 29 to 31. The concert, titled '2026 I.O.I Concert Tour: LOOP in SEOUL,' marked the group's first full-member performance in 9 years. | I.O.I, a popular South Korean girl group, has successfully concluded their 10th-anniversary concert in Seoul. The group, which consists of 9 members, including Lim Na-young, Chungha, Kim Se-jeong, and Jeon So-mi, performed at the Jamsil Indoor Stadium from May 29 to 31. The concert, titled '2026 I.O.I Concert Tour: LOOP in SEOUL,' marked the group's first full-member performance in 9 years.