UP10TION (Hangul: 업텐션; pronounced "up-tension") is a South Korean boy group formed by TOP Media in 2015. The group consists of ten members: Jinhoo, Kuhn, Kogyeol, Wei, Bitto, Sunyoul, Wooshin, Gyujin, Hwanhee, and Xiao. The group debuted with a mini album, Top Secret. And later on in 2017 Debuted with the mini album, "ID" in Japan. On July 2015, UP10TION made its official debut by introducing each member, one by one, through their show Masked Rookie King, also known as King of Masked Rookie UP10TION, which is a parody of MBC's King of Mask Singer. The members competed and showed their abilities and charms while wearing a mask in front of a panel of judges. Those that were selected took off their masks. The panel of judges were Shinhwa's Andy, Teen Top's Chunji, and 100%'s Rokhyun and Chanyong. The first member that was introduced was Wooshin and he was described as a look-alike of the actor Park Bo-Gum. The second and third members were Jinhoo and Hwanhee. The fourth member was Bit-to with a deep soulful voice and the fifth was Kogyeol with a powerful and emotional vocal. The sixth and seventh members were Kuhn and Sunyoul, who both have charming looks and voices. The ten-member group was finally introduced with its latest members Wei, Gyujin, and Xiao.

2015: Debut with Top Secret and BRAVO!

On September 9, UP10TION held a debut showcase at AX Concert Hall in Seoul. UP10TION's debut mini album Top Secret, which includes the debut single "So, Dangerous," was released on September 11, 2015. The album debut at number 9 and peaked at number 7 on Gaon Album Chart. They made their official music program debut on September 10 through Mnet's M! Countdown, performing their debut single "So, Dangerous." They also had their debut album showcase in Beijing, China on September 22. The "So, Dangerous" music video was ranked 9th place in Billboard's Most Viewed K-pop Videos in America for the month of September 2015. On November 26, UP10TION released their second mini album BRAVO! with the lead single "Catch me!" which was produced by Iggy and Yong Bae, who produced Ailee′s Heaven and GFriend′s Me Gustas Tu. It also includes the track Party2nite which was written and composed by Teen Top's Changjo. The album peaked at number 5 on Gaon Album Chart.

2016: Spotlight, Summer Go! and BURST

UP10TION released their third mini album Spotlight with the title track "Attention" on April 18. On May 2016, TOP Media confirmed that UP10TION will hold their Japanese debut showcase in Tokyo on June 4, followed by a showcase at the Osaka River Forum on June 5. On August 5, UP10TION released their fourth mini album Summer Go! with the title track "Tonight", which marked their first summer release. UP10TION returned to released their fifth mini album BURST with the title track as "White Night." The EP was released on November 21 at 00.30 KST, after announcing a 30-minute delay from releasing the album at its original midnight time.

2017: Japanese Debut and Wooshin's hiatus

UP10TION released their Japan debut single 『ID(アイディー)』on February 27, 2017. On June 6, TOP Media issued a statement regarding Wooshin's hiatus. It was stated that his psychological condition had worsened due to the mental stress that he had been receiving since the end of 2016, due to a controversy that alleged he had inappropriately touched his "The Show" co-host, Jeon So-mi, near her chest area during a video. There were official statements released by both parties' agencies that denied these claims. and the production staff from "The Show". With Wooshin on hiatus, UP10TION continued their activities as nine members. They released their sixth mini album STAR;DOM on June 29. The EP contained six tracks, with title track "Runner". On October 12, the group released 2017 Special Photo Edition, containting two tracks, including title track "Going Crazy".

2018: Wooshin's Return and First Album

Up10tion will be having a comeback on March 15, 2018. Top Media has been releasing individual teasers. On March 15, the group will release a full album called Invitation. This comeback will include all 10 members.- Wikipedia