- Baek A Yeon
- Amugeotdo Hagi Silheumyeon Eotteokae (아무것도 하기 싫으면 어떡애; 0%)
- Oero WAR (외로 WAR)
- Bettuleojillae (베뚤어질래)
- Geuraeseo Yojeum Saenggagi Manha (그래서 요즘 생각이 많아)
- Hwansang (환상)
- Amugeotdo Hagi Silheumyeon Eotteokae (Inst.)
Observe is the fifth mini-album released by Baek A Yeon. The song "Amugeotdo Hagi Silheumyeon Eotteokae" was used as the lead track. It was originally set to be released on July 13, but was postponed due to positive cases of COVID-19 in the cast of the musical On Air - Spin Off, where Baek A Yeon was acting. She tested negative but went quarantine for two weeks.