Park Si-eun, known mononymously as Sieun, is a South Korean singer and actress under High Up Entertainment. She is a member of the girl group STAYC and a former member of the trainee team i-Teen. She made her acting debut in the children's television series Pluto Squad (2014).

Filmography

• Table Tales
• Make Mate 1 — Special C Mate
• IDOL 1N2D
• Lee Mujin Service — Guest
• Do You Like Brahms? — Jo Soo-an
• Mystic Pop-up Bar — Young Wol-joo
• Everything and Nothing — An Seo-yeon
• The Crowned Clown — Choi Kye Hwan
• Still 17 — Woo Seo-Ri (young)
• Criminal Minds — Han Ji-Eun
• Just Between Lovers — Ha Moon-Soo (young)
• Queen For Seven Days — Shin Chae-Kyung (young)
• Signal — Oh Eun-ji
• The Good Wife — Lee Seo-Yeon
• 2015Love Forecast — Joon-hee
• Rad Science — Jennie
• Six Flying Dragons — Yeon-hee (young)
• Pluto Squad — Jin Sun Mi
• Pride and Prejudice — Han Yeol-mu (young)
• Daddy's Sorry — Hye-Ri
• Weekly Idol — Sieun

Appearances as themselves (15)

• KPOPPED — Self
• 2025STAYC TOUR [STAY TUNED] in Sydney — Self
• Inspector — Self
• 2024STAYC 1st World Tour [TEENFRESH] in Seoul — Self
• Idol Complaint Manager HUR — Self
• PANGPANG STAYC — Self
• STAYC's Secret in Busan — Self
• Blue Dragon Series Awards — Self
• Just an Excuse — Self
• Show!terview with Sunmi — Self
• K-Pop Evolution — Self
• STAYCation — Self
• The Silence Of IDOL — Self
• Men on a Mission — Self
• Mystery Music Show: King of Mask Singer — Self - Panelist