Original sentence: Important albums released via  UMG that included Count Down With You(1999), Big Heat(2000), and Untitled(2000).In 1997, Cheung held his first post-retirement concert series, World Tour 97.The hit songs released by him during this peoriod included  Passing-by Dragonfly, the top one hit song, Big Heat, and Left Right Hands , Top Ten Gold Song of the Year (1999).This concert series lasted from December 12, 1996 to June 17, 1997 and included 55 concerts, 24 concerts were held in Hong Kong Coliseum and 31 concerts were held in major cities in Japan, mainland China and other parts of the world
Edited sentence: 12, 1996 to June 17, 1997.Among them, six concerts were held in Japan and mainland China respectively.Important albums released via  UMG includes Count Down With You(1999), Big Heat(2000), and Untitled(2000).In 1997, Cheung held his first post-retirement concert series: World Tour 97, which lasted from Dec.Like his music, Cheung introduced a new image to his audience.The hit songs released by him during this peoriod include  Passing-by Dragonfly, the top one hit song, Big Heat, and Left Right Hands , Top Ten Gold Song of the Year (1999).The most daring part possibly was the closing dance "Red" where Cheung did a tango duet in a pair of red high-heels with a macho dancer.World Tour 97 included 55 concerts: 24 concerts were held in Hong Kong Coliseum and 31 concerts were held in the cities around the world.World Tour 97 was the first concert series that Cheung held in these two areas