"Shy Boy" is a single by South Korean girl group Secret. It is released as a CD single on January 6, 2011 through TS Entertainment. The song was written and produced by Kang Jiwon and Kim Kibum. It was remade with Japanese lyrics and was on Secret's first Japanese EP, Shy Boy. According to Gaon, "Shy Boy" has sold over 2,215,864 digital downloads in South Korea as of December 31, 2011.

Secret (Korean: 시크릿) was a South Korean K-pop girl group formed by TS Entertainment in 2009. The group originally debuted with four members: Jun Hyo-seong, Jung Ha-na, Song Ji-eun and Han Sun-hwa. They released their debut single I Want You Back October 2009. Secret's debut single did not meet great success and it was not until the following year that the group saw a rise in popularity. In 2010, Secret released two singles Magic and Madonna which earned much attention with both singles peaking at No. 2 and No. 1 respectively on the Gaon Digital Chart. With the success of "Magic" and "Madonna", the group received the "Newcomer Award" at the 25th Golden Disk Awards.