On July 29th, 29, T-ara officially debuted as a six-person team, with Han Enjing as the first team leader. On July 16th, 21, Liu Huaying, a member of the T-ara team, was added from the 6-member team to become a 7-member team. Jeon Bo Ram replaced Han Enjing as the second team leader of the T-ara team.
in p>211, T-ara and J-ROCK of Japan signed an exclusive contract of 35 million yen to enter Japan. T-ara's Japanese record company was identified as "Toshiba EMI", and Japan's "J-ROCK" was responsible for the brokerage and marketing. On June 14th, HyoMin replaced Jeon Bo Ram as the third captain of the T-ara team [2]. On June 29th, only one hour after the sound source and MV of the T-ara group "roly poly" were released, it was ranked first in the real-time music charts such as cyworld, GomTVmusic, bugs and nate. On July 1st, T-ara and composers Xinshadong Tiger and Cui Kuisheng jointly released the second edition of the song "bo peep bo peep", "roly poly". On July 14th, the T-ara group "Roly-Poly" won the first place in MCOUNT DOWN, and T-ara held a fan signing meeting at synnara record Children's Park in Hanjiang Road, Longshan District, Seoul at 8 pm that day. On August 3rd, the MV of T-ara group Roly-Poly in Copacabana》MV was released in the afternoon, and occupied the first place in the GomTV MV list 49 minutes later. On August 26th, the sound source of T-ara group roly poly sold 2 billion won and won the first prize of the year [3]. On August 31st, T-ara group served as the propaganda ambassador of "211 Competitive Skill Game Celebration". On September 28th, T-ara officially debuted in Japan, and Bo peep bo peep took the first place in the oricon daily list on the first day of its release, with a sales volume of more than 2, copies [4]. On September 29th, the T-ara group made their debut in Kawasaki City to commemorate the SHOW. On October 31st, T-ara released the MV preview video of "cry cry" for the first time through GOM TV. On November 2th, the lyric MV of T-ara group "Cry Cry" was officially released. On December 7th, the chorus "Aren't We in Love" by T- ara and davichi was published, and So-Yeon Park replaced HyoMin as the fourth captain of T-ara [5]
On January 2nd, 212, Lovey Dovey by T-ara was published. On January 1th, the Japanese MV of T-ara group Roly Poly was officially released. On February 16th, Core Centens Media, a T-ara portfolio brokerage company, opened an official channel on YouTube. On April 5th, T-ara Portfolio Brokerage Company indicated that two new members, Li Yalin and Danee, were added from the 7-member portfolio, making it a 9-member portfolio. On May 3th, the resume and photos of Danee, the 9th preparatory member of T-ara Group, were made public [6]. On June 3rd, the T-ara group held its first ticketing concert in Bangkok. On June 6th, T-ara released its first regular Japanese album "Jewelry Box" and held its first concert tour in Japan in the same month. On July 6th, the sixth extended play "Day By Day" of T-ara group was officially released. On July 7th, Li Yalin, the 8th member of the T-ara group, officially joined the group and started activities [7]. On July 3th, Liu Huaying, the 7th member of the T-ara portfolio, withdrew from the portfolio and terminated the contract with the brokerage company. On September 3rd, the seventh extended play MIRAGE of T-ara was officially released [8].
On March 2th, 213, the Japanese single Bunny Style was released [9]. On April 1th, T-araN4, the first team of the T-ARA group, was officially released, and will release the Korean single Return [1] in early May. The team members are: Zhi Yan, En Jing, Xiao Min and Ya Lin [11]. On April 14th, T-ara N4 made public the alternative posters of its members, and on the 15th, it made public the modeling photos and previews of all its members. At the end of the month, it released an album and made its debut in public [12]. The theme of the title song "Pastoral Diary" came from the TV series "Pastoral Diary" [13]. On July 1th, Li Yalin, a member of T-ara group, withdrew from the group and announced his solo flight. On July 1th, T-ara portfolio brokerage company indicated that Danee would join T-ara N4 team instead of Li Yalin, but not T-ara. On July 14th, Lee Ji Hyun replaced So-Yeon Park as the fifth captain of the T-ara team [14-15].