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2. Sae-byeok's Accent

Though many are aware of the conflict between North Korea and South Korea, as well as the struggles of those trying to escape North Korea, a lot of the Kang siblings' issues may not be clear to non-Korean viewers.

Kang Sae-byeok is looked down on for being North Korean, referred to as a "North Korean spy" and looked down on for her origins. Her brother, Kang Cheol, is bullied by the children in the home she put him in to be cared for while she's away doing jobs.

Sae-byeok spends all her money that she gets from pickpocketing supporting her brother and trying to find their parents and bring them to South Korea after their escape ended with their father being shot and their mother sent back to North Korea by Chinese border agents. Her skinny appearance and prominent bones may even represent one of the main reasons North Koreans try to escape - starvation.

Another aspect that wouldn't be obvious to international viewers is Sae-byeok's North Korean accent. It's clear to Korean viewers that she speaks in a North Korean accent when she talks to her brother, but hides her accent among South Koreans to not stand out.