There was a stir in Tam Hee's class. The reason is that a mysterious crystal appears in the glass that is in the classroom. In fact, the day before, there was nothing there. Tam Hee and Hee Jong also try to solve the mystery armed with scientific knowledge of mixtures and solutions. Did they succeed? The Smart Science series is a storybook with interesting science content that can be accessed via smartphones. Children will get new experiences in learning science through stories, experimental videos, animations, and fun apps.