Looking at the unfamiliar chemical formulas and the sequence of numbers, Jung Tae-eui thought,'My brother is going to an unknown world again,' went up to the sofa next to him and opened a normal humanities book that he could understand.Looking at the list of unfamiliar formulas and numbers, Jeong-tae-so, who thought, "My brother has crossed into another unknown world," went up to the sofa next to him and pulled out an ordinary humanities book that he could understand.Looking at the list of strange chemical formulas and numbers, Zheng Taiyi felt that "my brother has entered an unknown world again." he climbed onto the sofa next to him and took out his ordinary humanities books that he could understand.