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I became my dad. No, it was my dad who became me. No, strictly speaking, we became each other. He used my body to go to school, do my homework for me, and take exams for me. And I use his body to go to work, hold parent-teacher meetings for him, and support his family. At first we all thought we were getting a big advantage. I don't have to go to school and he doesn't have to go to work. As a result, The first week, I got zero points for my homework. In the first month, his company almost went bankrupt. Finally, we sat facing each other and said in unison: "Shall we change back?" Unfortunately, no one knows how to change it back.