"Something" is a song by South Korean pop duo TVXQ, also known as Tohoshinki in Japan. Serving as the lead single for their seventh Korean studio album Tense (2014), the song was produced by TVXQ's long-time collaborator Yoo Young-jin and co-written by Yoo with his brother Yoo Han-jin. Introduced as TVXQ's tenth anniversary comeback single, "Something" was released by S.M. Entertainment on January 6, 2014. Two versions of the song exist; the original Korean-language version, and a Japanese-language version, which was released by Avex Trax as a double A-sided CD single, along with "Hide & Seek", in Japan on February 5, 2014. It served as the fourth and final single release for the duo's seventh Japanese studio album, Tree (2014). Within a week of its release, the single was certified gold by the Recording Industry Association of Japan (RIAJ) for shipments of over 100,000.

Noted for being a major musical departure from TVXQ's earlier songs, "Something" is a song that incorporates swing performance styles with modern dance-pop. The song deals with a narcissistic male protagonist who tells women that they need to have "that something" in order to attract him. The accompanying music video, filmed in early December 2013, premiered on January 1, 2014 at 6pm KST.

"Something" was written by Yoo Young-jin and Yoo Han-jin, both who have been close collaborators with TVXQ since their debut in 2003. The production credits of "Something" was first revealed in early December 2013 by the Korea Music Association, which also revealed details of four other tracks in the album. The song is described to be upbeat and jazzy with a modern twist. The lyrics deal with a narcissistic male protagonist who brags about his popularity and his endless amount of female admirers. He wants to meet a woman who has "got that something" so he can have her fall in love with him.

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