Once upon a time, there was an island called 'SUSLAND' with lush forests. But now people have built houses and factories instead of forests. The island is affected by industries, causing health problems. Beril and her friends come together to find a cure for the air pollution. They meet with factory owners and ask them to install filters in their chimneys. After the filters are installed, the air pollution decreases, trees grow rapidly, and nature is restored. The children raise awareness and organize nature trips to protect the beauty of nature. Over time, they manage to eliminate all the problems that harm nature and living things. Now, 'SUSLAND' is once again a magnificent place to live!