Five Treasure Box is the fourth studio album by South Korean rock band F.T. Island. It was released in South Korea on September 10, 2012, under FNC Entertainment and distributed by Mnet Media. Being the band's first studio album in three years, the title of the album reflects the "treasure" of the songs on the album, where they contributed to seven of the ten tracks on the album by songwriting or composition. The album sold over 30,000 copies in its first week and debuted at number one on the weekly Gaon albums chart. The single "I Wish" has peaked at number eight on the weekly Gaon singles chart and earned F.T. Island one K-Chart win on Mnet's music television program M! Countdown.

The album is titled Five Treasure Box due to the members contributing to the lyrics and composition of seven of the ten tracks on the album. Guitarist Choi Jong-hoon stated that the band "worked on everything from guitar rift, sound and song genre". The album includes five Korean-language tracks previously recorded in Japanese. Speaking of these tracks, bassist Lee Jae-jin explained that "it was too much of a waste to lock up our songs [in Japan]". The band rewrote the lyrics in Korean and suggested to FNC Entertainment to include them on the album. Drummer Choi Min-hwan explained that the band chose "the best" songs to rewrite, while taking the "album’s mood" into consideration.

On the album jacket photos, each member was pictured with their most "treasured" possessions. Guitarist Choi Jong-hoon was pictured with exercise equipment, lead vocalist Lee Hongki was pictured with his three dogs, bassist Lee Jae-jin was pictured with magazines, comic books, and potato chips, drummer Choi Min-hwan was pictured with a television and a teddy bear, and guitarist Song Seung-hyun was pictured with sheet music and a headset.

Five Treasure Box contains elements of modern, acoustic, and punk rock music. The promotional track "I Wish" was written by Han Seong-ho and composed by Kim Do-hun and Han. Classified as a pop rock song, "I Wish" begins with an acoustic guitar, and the song gradually builds up into the chorus. The band members spoke of disappointment that the song was being used as the promotional single. They expressed understanding in the choice of FNC Entertainment wanting to promote a song with wider appeal, but the band showed preference over the tracks they composed.

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