Children who live in hiding with superpowers, along with their parents who live with painful secrets of the past, face enormous dangers together.

A paragliding mishap drops a South Korean heiress in North Korea -- and into the life of an army officer, who decides he will help her hide.

Ae-ran, a mother who is proud with her son hears a shocking news that her son, Dohoon, who left the military has developed schizophrenia. Afraid of losing her perfect daily life, Ae-ran decided to hide his son's illness. But her secret life that seemed to be smooth started to change when Kyeong-hwa, the only person who knows her secret appeared, gradually turning her anxiety into madness.