The music video features a small amount of dance scenes. The video starts with a plane landing, followed by a silhouette of the girls forming a line and then dancing. During this, text appears saying “Into the New World, Or Not.. It’s Up to Your Choice.. [sic]”. Throughout the music video, it shows the girls doing activities, either alone or coupled with another member. The activities done by the girls are:
Taeyeon is flying a light aircraft with Sooyoung accompanying her. In the video, the light aircraft Taeyeon flies is broken, and she attempts to repair it, with Sooyoung praying. The light aircraft is successfully repaired and both of them are happy. In the last part of this scene, Sooyoung is seen chasing Taeyeon's light aircraft.
Yuri is a barista, and she is seen making a latte. In one scene, she puts a pot of flowers onto a desk.
Hyoyeon is purchasing a pair of white training shoes at a department store, after which she dances on a stairway.
Sunny and Jessica are making graffiti. The graffiti says "New World 2007".
Tiffany is repairing a scooter (specifically, a Yamaha Fino 115) and repaints its body with pink color with flower motif and customizing its license plate. The customized license plate says "Tiffany" with the hanja version of Girls' Generation above it.
The physical edition of "Into the New World" debuted at number 5 on the chart for August 2007 compiled by the Music Industry Association of Korea (MIAK), selling 10,823 copies in its first month of release. It was the 41st best-selling CD release of 2007 in South Korea, selling 22,818 physical copies in total. In 2010, the single peaked at number 2 on the Gaon Album Chart for the chart issue dated April 18 – 24, based on physical sales. It became the 9th best-selling release of April 2010 in South Korea.