The team returns to 4546B to explore another part of the planet. This time, they find themselves in the arctic sea around Delta Island, where new magnificent and dangerous episodes await them. Spoiler Alert: Hongjoong takes Seonghwa with him, of course. Sequel of 'Lost Sea'

Hongjoong is part of a research team on Aurora, one of the biggest and safest spaceships to ever cross the skies. Or rather Hongjoong WAS part of a research team. Because the Aurora just crashed on Planet 4546B due to hull failure. Hongjoong, of all people survived and now has to find his way back home from some unknown water planet. And as if all of that was not already bad enough the android assigned to him is not sweet KYS 17 with whom he usually worked. It was PSH 22, notorious for being an annoying tin box. And he did not even have an stop button.