She had her first kiss with Yeo Jin Goo for their drama "Missing You". It was both their first kiss.
Kim So-Hyun was born in Australia. She moved to South Korea when she was seven years old.
In December 2015, she launched her own one-person agency, E&T Story Entertainment, in partnership with LOEN Entertainment.
In January 2018, the Pyeongchang Organizing Committee for the 2018 Olympic & Paralympic Winter Games chose Kim as the National Representative of Honorary Smile to represent Korea's smile and kindness along with Yoo Seung-min.
She learned how to play piano from her drama "Page Turner".
She debuted as a child actress in 2006.
She grew up in a single-parent household. Her dad passed away when she was young.
Kim has cited Son Ye-jin and Canadian actress Rachel McAdams as her main influences because of their sophisticated and graceful look. She has also cited Moon Geun-young as someone who inspired her to digest various roles after watching Moon's performance in Painter of the Wind (2008).
At the age of 21, Kim became the youngest South Korean actress to have more than 10 million followers on social media, alongside actor Lee Min-ho.