전효성 has signed an exclusive contract with Major Nine, marking a new beginning in her career. She debuted in 2009 as a member of the girl group Secret and has since then explored various fields such as singing, acting, and radio DJing. | 전효성 has signed an exclusive contract with Major Nine, marking a new beginning in her career. She debuted in 2009 as a member of the girl group Secret and has since then explored various fields such as singing, acting, and radio DJing.