The Korean version of "Noona Neomu Yeppeo (Replay)", released as a digital single on May 22, 2008, was included as the lead track in Shinee's first Korean EP, Replay, released on May 22, 2008. The music video included f(x)'s Victoria as the female lead. The single turned into a hit, especially with the adult female demographic because of its line about "Nuna (older sister), you’re so pretty". Rino Nakasone, a Japanese dancer and choreographer, choreographed the song.
The title track is the Japanese remake of their debut Korean single "Noona Neomu Yeppeo (Replay)", included on their Korean debut mini-album of the same name. The B-Side is the Japanese version of their Korean single "Hello", part of their second repackage album.
The single was released in two CD+DVD versions. The limited version was packed in a digipack includes two bonus tracks, a 68 pages photobook and a random (1 of 6) trading card. The regular version contains with a different 44 pages photobook and a postcard (for first press only).
It sold 50,2700 copies on its release date, debuting at the #2 spot of the Oricon Daily Singles Chart. In the first week of sales, it sold over 91,419 copies giving them second place on the Oricon Weekly Chart. It is also the most sales a Korean idol group has had for their debut in their first week of sales.
It was certified gold by the RIAJ for having 100,000 physical copies shipped in June 2011, a first for a debut single for a Korean male group  and also won the #1 Single of the Year in Japan’s "K-Pop Lovers!" Awards 2011 by Tower Records Online.
Shinee celebrated their Japanese debut by performing at the famous Abbey Road Studios in London on June 19, 2011. They were the very first Asian artists to perform at the studios. After their reception in London, Shinee started their Japan Debut Premium Reception Tour in Japan. They performed a number of concerts while touring various cities across Japan including Fukuoka on July 22, Kobe on July 23, Tokyo on July 27 and 28, Sapporo on August 8 and Nagoya on August 11, 2011.