[4][5][6] Prior to her debut, MSN Japan made a video documentary capturing her pre-debut training and rehearsals, which attracted 480,000 visitors in five days.

Son trained with a well-known American choreographer in preparation for this album, and people began calling her the female version of Rain.

Son joined MBC's reality show We Got Married, being paired with Marco in late 2008 as part of the second group of couples.

[10] However, as the movie was delayed, Son released an EL with the single "Toyoil Bamae" ("토요일 밤에", "On a Saturday Night").

[13] She then starred in SBS drama Dream with Joo Jin-mo and Kim Bum, marking her debut as an actress.

[14] After training in the United States after "Cry Eye", Son returned to Korea and released an EP, Mini Album Vol.1, with a focus on electronica (departing from her previous style of crunk pop) on April 29, 2008.

Kahi (former leader of After School and Pledis labelmate) was her dance teacher and was featured in the "Bad Boy" music video.

[15] The dance has been copied and parodied by many people, including Hyun Young,[16] Infinity Challenge comedy team member No Hongchul, comedian Shin Bong-sun, and Lee Soo-young.

[22] Son married former South Korean national speed skater Lee Kyou-hyuk on May 13, 2022 in a private ceremony.