"Fantagio's 2021 business report"(PDF). Fantagio Corp. Official Website. March 20, 2022. Archived(PDF) from the original on March 20, 2022. Retrieved March 20, 2022.
Kim, Yunji (September 1, 2021). "판타지오, 판타지오뮤직 흡수합병 결정" [Fantagio decides to merge with Fantagio Music]. EDaily (in Korean). Archived from the original on September 2, 2021. Retrieved September 2, 2021.
Yoon, Gi-baek (August 14, 2015). 판타지오 뉴 보이그룹, 팀명 '아스트로' 확정 (in Korean). Sports World. Sports World. Archived from the original on November 11, 2017. Retrieved December 22, 2017.
"김도연X최유정 걸그룹 위키미키, 8월 8일 데뷔 확정(공식)" [Kim Do-yeon and Choi Yoo-jung girl group Weki Meki debut confirmed for August 8 (official)]. Naver (in Korean). July 10, 2017. Archived from the original on September 3, 2018. Retrieved July 10, 2017.
Lee, Min-ji (February 14, 2020). "옹성우 측 "상반기 앨범 발매 계획, 시기 조율 중"(공식입장)" [Ong Seong-wu is "planning to release an album in the first half of the year, timing is being adjusted" (official statement)]. Naver (in Korean). Archived from the original on February 16, 2020. Retrieved February 16, 2020.
"Fantagio's 2021 business report"(PDF). Fantagio Corp. Official Website. March 20, 2022. Archived(PDF) from the original on March 20, 2022. Retrieved March 20, 2022.
Kim, Yunji (September 1, 2021). "판타지오, 판타지오뮤직 흡수합병 결정" [Fantagio decides to merge with Fantagio Music]. EDaily (in Korean). Archived from the original on September 2, 2021. Retrieved September 2, 2021.
Yoon, Gi-baek (August 14, 2015). 판타지오 뉴 보이그룹, 팀명 '아스트로' 확정 (in Korean). Sports World. Sports World. Archived from the original on November 11, 2017. Retrieved December 22, 2017.
"김도연X최유정 걸그룹 위키미키, 8월 8일 데뷔 확정(공식)" [Kim Do-yeon and Choi Yoo-jung girl group Weki Meki debut confirmed for August 8 (official)]. Naver (in Korean). July 10, 2017. Archived from the original on September 3, 2018. Retrieved July 10, 2017.
Lee, Min-ji (February 14, 2020). "옹성우 측 "상반기 앨범 발매 계획, 시기 조율 중"(공식입장)" [Ong Seong-wu is "planning to release an album in the first half of the year, timing is being adjusted" (official statement)]. Naver (in Korean). Archived from the original on February 16, 2020. Retrieved February 16, 2020.