Ksenia Avdeeva, born on 15 June 2006 in Odessa, is a Ukrainian actress and blogger known for her role as Ksyusha Stepanuk in the web series School Through the Eyes of a Schoolboy (STS). She became a central character starting from the fourth season, portraying complex relationships that add drama and romance to the storyline.

She maintains an active presence on social media, with 121,000 followers on Instagram, 70,000 on Telegram, and a TikTok account where she posts trending videos. Her engagement on these platforms has contributed to her popularity among Ukrainian youth.