Masstomizing is new paradigm suggested by DAEJIN HAN(Jay Han)/KOREAN. It is customize-able mass production concept. over 100 years, mass production was copy of fixed specification. People who doesn't want these kind of PRODUCT, Their only one option is customizing. But it's expensive and unstable. Today's technology like A.I , 3D printing and Smart factory can solve this problem. Masstomizing product will has same price, same speed, same stability, same duribility with mass producted products even though it is customized with every single person's different taste. It will change manufacturing industry.