Passage: 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 Hyoseong, Jung Hana, Song Jieun and Han Sunhwa. 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. During Secret's early days the group was known as "basement idols" because of the poor living conditions they were in, but with their rapid success the group was able to move into better conditions.In 2011, Secret adopted a girl-next-door image through songs like Shy Boy and Starlight Moonlight which led the group to major success. With the hit single Shy Boy Secret won their first music show award on M Countdown; they also managed to stay at number one on Music Bank for three consecutive weeks, earning them a triple crown. Shy Boy and Starlight Moonlight won Secret multiple awards including two Song of the Year awards at the 1st Gaon Chart Awards for the months of January and June. Secret released their first full-length album Moving in Secret in October 2011, featuring the lead single "Love is Move" which showcased Secret's sexy and confident side again. With the group's success in South Korea throughout 2011, Secret sold over seven million in digital download sales.

Question: How many original members were there?
four