fromis_9 Lee Seo Yeon (01-34)

Lee Seoyeon (서연) - Former Main Rapper [2018-2025]

Profile & Basic Information

Born January 22, 2000, in Seoul, South Korea, Lee Seoyeon brought extensive training experience to fromis_9 members. Standing at 158 cm with blood type A, she holds an ISTJ personality type. Her family includes two older brothers and a baby brother. She attended SOPA and graduated before pursuing her entertainment career. Prior to fromis_9, she spent over seven years as a YG trainee, gaining recognition as part of the pre-debut group "Future 2NE1" and appearing in GD&TOP's "Knock Out" music video.

Former Position in fromis_9

Seoyeon ranked 7th in Idol School with 61,083 votes, securing positions as Main Rapper, Lead Vocalist, and Lead Dancer. Nicknamed "Captain of Swag" and "Baby Panda" by members, she contributed songwriting credits to tracks including "My Little Society," "Midnight Guest," and "Unlock My World". She departed following contract termination on December 31, 2024.

Fun Facts & Personality Traits

Her representative emoji is the panda, earned from dark circles under her eyes giving her a perpetual "Sleepy Head" appearance. She plays acoustic guitar, enjoys watching romance and animation films, and collects chokers. Members consider her the most fashionable fromis_9 member. She once nearly burned the dorm by microwaving metal packaging during a live broadcast. She owns a cat gifted by her aunt.

Post-fromis_9 Activities

On July 23, 2025, Seoyeon signed with H1GHR Music, a prominent hip-hop and R&B label. She adopted the stage name Y:SY and made her solo debut on November 17, 2025, with the digital single "Naked," produced by C'SA and Jinsol. She contributed to the lyrics, marking her transition into R&B-driven solo artist.