As the interest in business start-up grows, the role of entrepreneurs is emphasized. Entrepreneurs seek to expand profits and grow their firms through business start-up. The success of business start-up is the basis for securing new markets, creating new profits, and growing new firms. Entrepreneurship, entrepreneurial orientation, and entrepreneurial activity are regarded as having important function and role in the success of start-up when entrepreneurs are willing to enter new business for start-up. Therefore, we can not help but pay much attention to entrepreneurship, entrepreneurial orientation, and entrepreneurial activities that affect the success and survival of start-up firms. In this study, we examine the concepts on entrepreneurship and entrepreneurial skills necessary for start-up as well as entrepreneurial orientation and entrepreneurial activities pursuing entrepreneurial success. And we present these concepts and definitions together for ease of understanding. In particular, we derive the conceptual items for concrete interpretation of these concepts and apply the results to the founder of Hyundai Heavy Industries, Chung Ju-Young, to materialize each concept. As a result of the processes and the contents of researches, the entrepreneurship of Chung Ju young can be found in nine dimensions as follows: patriotic spirit, challenging spirit, pioneering spirit, creativity spirit, innovation, credit first principle, technology priority, positiveness, and diligence and faithfulness. And his Entrepreneurial skills are presented as seven conceptual items: associating, questioning, observing, experimenting, networking, problem- solving, and awareness-raising and persuasion. In addition, the entrepreneurial orientation of Chung Ju-Young is presented in five dimensions: innovativeness, risk-taking, proactiveness, autonomy, and competitive aggressiveness. And his entrepreneurial activities are divided into five categories: profit-seeking, growth seeking, global market development, business model innovation, and philanthropy. The main conclusion of this study is that the commonly used entrepreneurship is the concept of start-up or entrepreneurial thought as entrepreneurial process, and entrepreneurial orientation and entrepreneurial activity are explained as the concepts of pursuing entrepreneurial success. Therefore, entrepreneurship and entrepreneurial skills are needed in the entrepreneurial process, and entrepreneurial orientation and entrepreneurial activities are regarded as concepts necessary for entrepreneurial success. In addition, they are explained in a series of relationships among them. We develop and present a conceptual models for future research.