Yu Na and Min Park have always longed for more excitement and surprises in life, but they never expected that the curtain of ordinary life would be completely lifted - their once seemingly inconspicuous parents actually hid the true identity of international spies.Now, the sudden disappearance of parents under suspicious circumstances is revealed, which is a much more crazier and thrilling adventure than they imagined.As the truth gradually emerged, the two brothers were also involved in a world full of conspiracy, danger and betrayal, and their destiny was rewritten from then on.