Seonjin majored in film directing and managed the studio ‘OVER THE FENCE’ in 2017. She worked as an assistant director and freelanced, handled planning, directed, and post-produced over 100 projects.

In 2021, she founded ‘TOURMALINE’ a production company based in Seoul where she currently works as a director. Her clients include CJ ENM, LAPONE Ent., SM Ent., HYBE, Spotify, Universal Music JAPAN, and others. She also collaborated with artists such as DXTEEN, ZHOUMI, TOMORROW X TOGETHER, JOYURI, LOONA, LAY ZHANG, CHUNG HA, AESPA, TAEYEON, amongst others.