Letter from Secret is the fifth extended play (promoted fourth Korean EP) by South Korean girl group Secret. The EP was released on April 30, 2013 and contains four tracks. "YooHoo", the album's lead single, marked the group's return to aegyo-inspired songs such as "Shy Boy" and "Starlight Moonlight".

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Quick Facts Letter from Secret, EP by Secret ...

Letter from Secret
EP by Secret
Released	April 30, 2013
Genre	K-pop bubblegum pop dance-pop
Label	TS
Secret chronology
Poison (2012) Letter from Secret (2013) Secret Summer (2014)
Singles from Letter from Secret
"YooHoo" Released: April 30, 2013

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Secret had their comeback performance on M Countdown on May 2, 2013. The group also performed "YooHoo" on various music shows such as Music Bank, Show! Music Core and Inkigayo in May and June 2013. Secret made a Japanese comeback on July 23, 2014 with the Japanese version of "YooHoo".

"YooHoo" peaked at number 5 on the Gaon Singles Chart and has 978,757 downloads. The EP has in total 1,063,071 DLs while it sold 8,532 copies.

These credits were adapted from the Letter from Secret liner notes.^[2]

• Kim Tae-sung – executive producer co-producing
• Song Jieun – vocals
• Han Sunhwa – vocals
• Jun Hyoseong – vocals
• Jung Hana – vocals, rap
• Kang Jiwon – co-producing, songwriting, arranger, music
• Kim Kibum – co-producing, songwriting, music