[1] Yoon Seo-yeon was born in Daejeon Metropolitan City, South Korea, on August 6, 2003.

[2] Yoon received several recruitment offers from various entertainment agencies in the past, but denied them all as she thought that being a celebrity wasn't for her and continued preparing to retake the CSAT.

[14] On November 18, Yoon was announced as a participant in the AI-produced mission-based MBC reality program Gone PD.

[16] On September 20, Yoon made her official acting debut in the web drama What Summer Likes as the main character, Baek Yeo-reum.

[17] In January 2025, Yoon appeared as a supporting character in the League of Legends Champions Korea sitcom, LOL Mans.