Formerly a child actress, she made her acting debut in 2011, since then, she has appeared in number of films and television series.
[2] She was nominated for Best Young Actress Award in 2016 for the KBS's TV series The Promise and On the Way to the Airport.
After graduating in acting from the Goyang Arts High School, she made her debut in the 2011 short film Working on Saturday.
[6] Park Seo-yeon has played childhood role of Soo Ae's in A Thousand Days' Promise (2011), Hwang Jung-eum's in Lucky Romance (2016) and Seo Ji-hye's in Crash Landing on You (2020), establishing herself as a child actress.
She has appeared in films playing young role in 26 Years (2012), Happiness for Sale (2013), and Scarlet Innocence (2014).