TWICE

The show started on May 5 and ended with Nayeon, Jeongyeon, Dahyun, Sana, Jihyo, Mina, and Chaeyoung. During the finale, Park announced that he intended to add two more members into the group, making it a nine-member girl group. By audience vote, Tzuyu was added, and by Park's choice, Momo was added, thus starting the beginning of TWICE.

Promotional photo for The Story Begins. On October 7, 2015, JYP launched the group's official website and announced on social media that the group would debut with the mini album The Story Begins with "Like Ooh-Ahh" as the title track. On October 20, the album and the song's music video were released online and through the Naver "V LIVE" App.

The group held their debut showcase the same day, where they performed "Like Ooh-Ahh" along with dance tracks "Going Crazy" and "Do It Again". The title track's music video hit 50 million views within five months of their debut and became the most-viewed debut music video for any K-pop group, later becoming one of the first K-pop groups to have their debut music video pass 100 million views. Promotional photo for Page Two.

On April 25, 2016, their second mini album Page Two was released. It contained a total of seven songs including the title track "Cheer Up" and "I'm Gonna Be A Star" which served as the theme song for SIXTEEN. TWICE won their first music program award on May 5, on M!

Countdown, exactly one year after the initial airing of SIXTEEN. On September 23, TWICE released their official colors, Apricot and Neon Magenta. Five days later, JYP Entertainment announced that the group was preparing for a late October comeback with a new album.

On October 10, the agency released a time table for their mini album, TWICEcoaster: Lane 1. thumb|left|Teaser photo for TWICEcoaster: Lane 1 The album along with the music video for its title track "TT" was released online on October 24 at midnight. After an hour of its release, they achieved an All-Kill by topping on all of Korea's major music charts for five days.

On November 17, "Cheer Up" became TWICE's second music video to reach 100 million views. Promotional photo for TWICEcoaster : Lane 2 On January 3, 2017, "TT" became TWICE's third music video to hit 100 million views, becoming the fastest K-pop group music video to do so and breaking its own record with "Cheer Up". It was revealed on January 10 that TWICE would be holding their first solo concert titled TWICE 1st Tour: TWICELAND The Opening with the first stop held at SK Olympic Handball Gymnasium in Seoul from February 17 and 19, as the first leg of their world tour.

On January 25, it was announced that Bangkok would be second leg of their tour. The venue would be Thunder Dome, Muang Thong Thani, Bangkok, Thailand on April 8. The following day, it was announced that Singapore would be the third leg in the world tour.

It was going to be held in The Star Theatre, The Star Performing Arts Centre, Singapore City, Singapore on April 29. On January 18, JYPE announced that TWICE were going to be making a comeback and releasing a special album titled TWICEcoaster: Lane 2. Later on February 2, it was announced that the album would come out on February 20, and the title song for album would be "...