Kim Sae-ron (born July 31, 2000) is a South Korean actress. She began her career when she was nine years old and became a popular child star through the films A Brand New Life (2009) and The Man From Nowhere (2010). As Kim reached her teenage years, she was cast in more leading roles, notably in the film A Girl at My Door (2014). She has also starred in television drama series, including Can You Hear My Heart (2011), The Queen's Classroom (2013) and Hi! School-Love On (2014). Her first adult lead role was in the television drama Mirror of the Witch (2016).
Kim has two younger sisters, Ah-ron and Ye-ron, who are also actresses. She attended Miyang Elementary School in Seoul, and graduated from Yang-il Middle School in Ilsan in February 2016. She then began attending School of Performing Arts Seoul.
Kim's first acting role was in the 2009 film A Brand New Life, directed by the French-Korean filmmaker Ounie Lecomte and loosely based on her life. Kim played the main character, a nine-year-old girl named Jin-hee, who is abandoned by her father at an orphanage after he remarries, and is later adopted by a French couple. Kim attended the Cannes Film Festival when the film was shown there in a special screening, becoming the youngest actress to be invited to the festival. She then co-starred with Won Bin in The Man From Nowhere, which was the highest grossing film in South Korea in 2010. She played Jung So-mi, the daughter of a heroin addict who is kidnapped by an organized crime ring. During filming, she was only allowed to watch her own scenes on the monitor. Kim won several awards for her first two roles, including Best New Actress at the Korean Film Awards and Buil Film Awards.