In the sequel to the series, four siblings have successfully completed their parents' rigorous training and become real agents. When the owner of a famous fruit juice brand reaches out for help, a brand-new adventure begins for the Sibling Team. The fruit juice recipe has fallen into the hands of a villain who wants to make all children as unhappy as himself using his secret mixture. This time, the mother, father, and siblings—the entire family—must work together to tackle this challenging mission. The Sibling Team, along with their parents, uses the power of love and intelligence to stop Kubi. Not only do they stop Kubi, but they also bring out the good within him. In the end, they learn a surprise from their mother. The Sibling Team is no longer four people, but five. Their new sibling is on the way.