[3] On December 4, 2022, Seo was introduced as the 10th member of TripleS through releasing the original soundtrack "I'm In Love You" for the Korean drama series, Reborn Rich.

[6] On April 19, Seo sang the Korean national anthem during a baseball game between Kiwoom Heroes and Samsung Lions.

[12] In January, Seo sang the theme song "We Go High" with Lun8's Ji Eun-ho at the 2024 Gangwon Winter Youth Olympics opening ceremony.

[13] On February 4, Seo released her third original soundtrack "My Hope" for the Korean drama series Knight Flower[14] TripleS made their debut as a complete 24 members on May 8, with the studio album Assemble24.

[15] On December 27, Seo released her fourth original soundtrack "First Night of Snow" for the Korean drama, Your Muse, My Goddess.