No-eul was born on June 25, 1994 in North Korea. As an adult, she became a soldier and gave birth to a child during or before 2017. Soon after that, she defected to the South by killing her superior officer and escaping to the demarcation line, dispatching the pursuit team sent after her as well. She was forced leave her newborn baby behind due to this.

There are strong similarities between No-eul and Kang Sae-Byeok as they are both North Korean defectors.