Hello, nice to meet you. I am Teacher Lee Mi-young (Math-Three), and I conduct fun critical thinking activity math classes with students. I have been studying mathematics with children for over 20 years and have also provided teacher training to help teachers teach math in an enjoyable and meaningful way. I always feel a sense of pity when I see students who do not yet know the joy of math and simply view it as a difficult and unpleasant subject. Once math becomes fun, you will come to like it, and once you like it, you will naturally learn it more deeply. I hope you will experience this process step by step with me. I am also an expert in math diaries. I authored the book *Children Good at Math Write Math Diaries* and have consistently conducted classes where children organize their math learning process through words and writing, helping them deepen their thinking. As you study math with me in a fun yet serious way, your ability to understand math, think critically, and explain it on your own will grow.