Every Letter I Sent You: "2020년 04주차 Album Chart". Gaon Music Chart (in Korean). Archived from the original on January 28, 2021. Retrieved January 30, 2020.
Cumulative sales of Every Letter I Sent You:
"2020년 01월 Album Chart". Gaon Music Chart (in Korean). Archived from the original on January 28, 2021. Retrieved January 20, 2021.
Cumulative sales of tellusboutyourself:
"2021년 01월 Album Chart". Gaon Music Chart (in Korean). Archived from the original on February 11, 2021. Retrieved February 11, 2021.
"2020년 50주차 Download Chart" [Week 50 of 2020 Download Chart]. Gaon Music Chart (in Korean). Korea Music Content Association. Archived from the original on January 13, 2021. Retrieved December 21, 2020.
k-mca.or.kr
"[한국음악콘텐츠협회] (사)한국음악콘텐츠협회, 음원∙앨범에 대한 '가온 인증제' 시행" [[Korea Music Content Association] Korea Music Contents Association, 'Gaon Accreditation System' for songs and albums] (in Korean). Korea Music Content Association. April 23, 2018. Archived from the original on November 11, 2018. Retrieved April 20, 2019.
Every Letter I Sent You: "2020년 04주차 Album Chart". Gaon Music Chart (in Korean). Archived from the original on January 28, 2021. Retrieved January 30, 2020.
Cumulative sales of Every Letter I Sent You:
"2020년 01월 Album Chart". Gaon Music Chart (in Korean). Archived from the original on January 28, 2021. Retrieved January 20, 2021.
Cumulative sales of tellusboutyourself:
"2021년 01월 Album Chart". Gaon Music Chart (in Korean). Archived from the original on February 11, 2021. Retrieved February 11, 2021.
"[한국음악콘텐츠협회] (사)한국음악콘텐츠협회, 음원∙앨범에 대한 '가온 인증제' 시행" [[Korea Music Content Association] Korea Music Contents Association, 'Gaon Accreditation System' for songs and albums] (in Korean). Korea Music Content Association. April 23, 2018. Archived from the original on November 11, 2018. Retrieved April 20, 2019.
Peak chart positions for singles as lead artist on Circle Digital Chart (previously named Gaon Digital Chart):
"Across the Universe". December 10, 2015. Archived from the original on September 27, 2018. Retrieved July 15, 2023.
가온차트 관찰노트 2편 [다운로드차트 누적 이용량] [Gaon Chart Observation Notes #2 (Download Count)]. Gaon Music Chart. Archived from the original on December 31, 2021. Retrieved December 31, 2021 – via YouTube.
"2020년 50주차 Download Chart" [Week 50 of 2020 Download Chart]. Gaon Music Chart (in Korean). Korea Music Content Association. Archived from the original on January 13, 2021. Retrieved December 21, 2020.
youtube.com
가온차트 관찰노트 2편 [다운로드차트 누적 이용량] [Gaon Chart Observation Notes #2 (Download Count)]. Gaon Music Chart. Archived from the original on December 31, 2021. Retrieved December 31, 2021 – via YouTube.