Before debuting with WANNA. B, she was a trainee under Happyface Entertainment. In 2015, she was added to the lineup of WANNA.
B after three of the original members left the group. She officially debuted as a member of the group on July 20, 2015 with their debut digital single "Attention". After announcing the news on December 26, 2018, Sejin made her solo debut with the digital single "Forget You" on January 3, 2019.
She left the group sometime after the release of the group's fourth digital single "Leggo".
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