Kim was born on January 19, 1999 at Ilsandong District, Goyang, Gyeonggi Province South Korea.

[2] Next Sohee is a film directed by Jung Ju-ri [ko] that portrays the story of a high school student undergoing on-site training at a call center and a female detective who questions the incidents.

In an interview, Jung Ju-ri shared the story of how she came to cast newcomer Kim Si-eun in the lead role.

It all started when Jung stumbled upon a YouTube video featuring Kim energetically hosting Educational Broadcasting System's Live Talk!

[3] Leaving a strong impression with Sohee's innocent and confident appearance in the movie, she won Best New Actress in Film at the 59th Baeksang Arts Awards.