When Geumseong's phone rang on Christmas Eve 2020, he answered nervously.
The previous year he'd made the perilous journey to escape from North to South Korea, using an international underground network of safe houses and brokers.
Eventually his mother's voice came from the speaker: "Geumseong, Geumseong, can you see me?"
Eunhee could hardly get her words out through sobs as her teenage son clasped his hand to his mouth.
"Mum, I'm doing well and I'm not sick," Geumseong quickly reassured her. The relief at seeing his mother's face was overwhelming.
