Han Sun-hwa, also known mononymously as Sunhwa, is a South Korean singer and actress. She is a former member of the South Korean girl group Secret. She made her television debut in 2004 while participating in SBS' Superstar Survival as a finalist, and in 2009, she was a regular cast on a variety show called Invincible Youth. Aside from music, she also ventured into acting and made her debut in the 2010 drama, More Charming By The Day. She also acted in several dramas with supporting roles in Ad Genius Lee Tae-baek, God's Gift: 14 Days, and Marriage, Not Dating.

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.