On his way to school, Hoon accidentally saves a toad. In return, the toad offers to grant him just one simple wish. Hoon first wishes to make up with his classmate after a fight, but the toad firmly replies that changing someone's heart is not simple. He then asks to switch his least favorite art class with gym class, but this is also denied. Even a request to replace vegetable side dishes with ham is rejected, as the toad explains that picky eating is not a trivial matter. Frustrated, Hoon finally asks, "What exactly is considered simple?" Can Hoon find a simple wish to be granted? This story teaches children important values like considering others' feelings and respecting promises, showing that these things are far from simple.