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Online shopping around world has been increasing, especially during Covid-19, since it can avoid contact and infection, but it caused enormous delivering package. Quarantine at home also makes people depressed and anxious. Waste carton and negative emotions induced environmental and social problems. Negatives Converter uses waste package and nail shaped spore pack to grow mushroom. Design of side hole allows mushroom grow better. Users can fold waste carton to fit in, and insert spore on side. After watering, mushroom would decompose waste and grow. At same time, negative emotions would relieve with actions of inserting and mushroom growing.