Zodiac-sign:
Korean: 세이
Japanese: セイ
Ansan, Gyeonggi
CountrySouth Korea
"Let's get crazy! Hello, I'm Sei!" Lee Seo-jeong (이서정), also known as Sei, is the lead vocalist and rapper of the girl group Weki Meki. She first appeared in Astro's music video for the song "Confession".