Lee Seo Jeong, known professionally as Sei, is a South Korean singer, dancer and member of WEKI MEKI. She graduated from Deos Middle and High School and is enrolled in the Creative Writing program at Hanyang Women's University. Before debuting, she started out as a trainee under LOUDers Entertainment. In 2016, she participated in "Produce 101" but was eliminated in episode 5 and ranked 85th overall. She joined Fantagio and debuted in 2017 as WEKI MEKI's vocalist and rapper with their 1st EP, "Weme", and has enjoyed moderate success and stability since then. In 2021, she had the lead role in the web drama “The Tale of Chunhyang”. (Source: NamuWiki)

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