Since the antiquity, we try to make the meaning of existence evident, and to answer the question proposed by Heidegger in a field of ontology. Even though the final answer is not given, the problem becomes clear. Such is the subjectivity for us, living after the declaration of the end of <Man> or <Subject> by post-modern philosophers. Certainly, we had lost the certitude of Cartesian cogito, but that we exist <now and here> is evident. Our existence is in <co-being> with others. So what we have to ask is in the sense of <being-together>. Belonging to some society or community, we recognize more and more what we owe to society, which is constituted <among -Us>, including < me> and <co-existing> with <others>. The fact we are everywhere as <Us>, shows that the ontological meaning of <Dasein> consists in the relation of/as <among-Us>.