Seo Da Hyun is the tenth member of tripleS and was revealed as S10 on December 3, 2022.
On November 25, 2022, DaHyun was anonymously featured in SIGNAL #151, in which she was informed that she was S10 and would be joining the previous 9 members in an upcoming subunit. Two days later, the sixth episode of Korean Drama Reborn Rich aired, featuring an OST accredited to DaHyun. DaHyun was officially announced as S10 on December 3 through social media. On December 5, DaHyun’s teaser image was uploaded on social media.
