**The Golden Time for Brain and Math Development in Ages 5–7, Proven by 20 Years of Educational Big Data** Hello, parents! I am Kwon Hee-won, an education expert at Kookg who will help you set the first milestones of your children's cognitive development. I am a veteran educator who has led the growth and academic advancement of countless children on the front lines of education for the past 20 years. Having tracked the growth trajectories of top-tier students for a long time, I have reached one conviction: the fact that "the roots of all learning capabilities are determined by cognitive and brain development during the ages of 5 to 7." Currently, as the General Manager of [Haberman MSG], an institution specializing in early childhood and elementary thinking skills and gifted mathematics, I am on the ground contemplating systematic educational processes that awaken children's brains. **