Subcultures originally belonged to niche cultural circles, but the concept of "kill line" successfully broke through the circle and became a public discourse, attracting global attention. This expression, which was transformed by Bilibili users based on game concepts, quickly broke the circle attribute originally used as a game term and achieved cross circle, cross country, and cross-cultural dissemination. It has become a typical case of subcultures breaking through circles and entering public discourse, and also provides useful references for creating new concepts, categories, and expressions that integrate China and foreign countries in international communication. The conceptual reconstruction of the "kill line" reviews the breaking path of the "kill line", the emotional connections in the conceptual reconstruction, or its logical core. Conceptual transformation is a key prerequisite for breaking the "kill line". When analyzing social issues in the United States, creators did not simply transplant existing concepts, but accurately grasped the deep meaning of "threshold triggering irreversible results". After theoretical sublimation, they introduced it into the field of American social issues and proposed the concept of "kill line", endowing cultural symbols with academic and ideological significance. Of particular importance is that when this concept enters the international discourse field, it retains its original high recognition while being endowed with new social value, increasing its potential for mass dissemination. The dissemination across the entire network forms the basis for breaking through the "kill line". Game subcultures were originally active on vertical platforms such as Bilibili and game forums. However, in the process of spreading the concept of "kill line", energetic young netizens have widely participated in secondary creation and re dissemination, breaking down this niche concept into various content forms based on the characteristics of different platforms. The collaborative communication of multiple platforms has gradually separated the "kill line" from the internal cycle of the subcultural community, infiltrated into the popular daily life, and completed the breaking circle and transformation of the concept of subculture. Emotional resonance is an important driving force for the breaking of the "killing line" and its dissemination. In the highly emotional Internet communication environment, the concept of "kill line" accurately hit the widespread life and even survival anxiety of the public. Especially the cruelty of the concept of "crossing the line and ending", which is highly compatible with the reality of "falling into a desperate situation with one accident" in American society. At the same time as proposing the concept, the creator supplemented it with real-life cases such as engineers who became homeless due to layoffs and ordinary people who refused ambulances due to high medical costs, making abstract concepts concrete and emotional, and enhancing the public's sense of immersion. The 'killing line' has thus been transformed into a tangible and debatable reality problem, inspiring emotional resonance among different age and occupational groups, and triggering widespread discussions in the US political, academic, news, and public circles. After breaking through the barriers of communication from cross circle to cross-cultural, the "killing line" began to spread overseas on social media and entered the mainstream media such as The New York Times, gradually breaking through multiple barriers such as language, culture, values, and cognition, transforming a subculture symbol into an analytical concept that reflects social issues. In the process of transitioning from cross circle to cross-cultural communication, the number of participants in concept dissemination continues to expand, further stimulating deeper emotional resonance. Conceptualization is the foundation for achieving cross-cultural breakthroughs through the 'kill line'. The creators have conceptualized and constructed relevant social phenomena by introducing the core connotation of the "killing line" into the field of social problem analysis. In the process of cross-cultural communication, creators are not confined to literal translation, but instead create more academically universal expressions such as "survival boundary" and "social elimination threshold", while retaining the exclusive English symbol "Kill Line", providing a stable symbolic pivot for understanding in different cultural backgrounds. Categorization is a key step in obtaining cross-cultural recognition for the 'kill line'. Due to significant differences in historical culture, social structure, and current issues among countries, a single "American killing line" is difficult to resonate widely. In practical dissemination, this concept has been continuously transplanted to different countries and regions such as Europe, America, Japan, Brazil, etc., and combined with local practical problems and specific cases to form an interpretation path with local characteristics. Through continuous transplantation and reinterpretation, the "killing line" gradually breaks free from geographical limitations, completes categorization transformation, and becomes a universal analytical framework for explaining different social survival risks. Universalization provides sustained momentum for the cross-cultural dissemination of the 'killing line'. Against the backdrop of rising international order and global economic uncertainty, issues such as climate change, artificial intelligence, employment, healthcare, and social security are widely present, and the "fragility" of human survival has become a global anxiety. Through universalization and sublimation, the 'killing line' has been shaped into a shared social experience that transcends language, culture, and regional limitations, breaking down barriers of understanding between different cultures and triggering emotional resonance across borders. A subculture symbol thus achieves the breaking through of barriers from cross circle to transnational dissemination, becoming an important concept for reflecting on the social survival issues of various countries. The transformation of the public discourse of circle culture into a "killing line" breaks through the boundaries of circle culture and grows into a cross regional and cross-cultural public discourse, providing a typical sample for understanding the extension of the public nature of circle culture. For a long time, youth subcultures have been labeled as "closed" due to their niche and hierarchical nature. The practice of breaking through the "killing line" has shown that subcultures and public discourse are not naturally opposed, and the emotions, needs, and psychology they carry have the inherent potential to transform into the public sphere. The public transformation of subcultures first requires precise alignment with the social psychology of the general public. The reason why "Kill Line" can break out of the gaming circle is that it accurately captures the survival anxiety psychology of the American public. After extending this concept to the public domain, almost all phenomena in learning, life, and work can be accurately summarized by the "kill line". Compared to the abstract expression of traditional public discourse, the popularization, interestingness, and summarization of circle discourse are more likely to trigger emotional resonance among the public. This emotional fit based on social psychology is an important prerequisite for the transformation of circle culture into public discourse. Secondly, spontaneous dissemination across all platforms is required. In the decentralized Internet context, the concept of "kill line" extends the publicity of the concept from the internal communication of the game circle, to the public discussion of the social platform, and to the scenario interpretation of the We Media. Each expansion of the communication channel extends the publicity of the concept, while Internet users extensively participate in the secondary creation with the help of the social media platform, promoting the value reconstruction of the concept. In the process of concept dissemination, different circles such as foreign netizens, self media, scholars, and media have diversified their interpretations of the "killing line" based on their own experiences, evolving it into a public discourse that combines humor and practical significance, gradually enhancing the public discourse attributes of subcultures. Finally, it is necessary to reconstruct discourse based on cultural integration. On the one hand, the personalized and interesting expressions contained in subcultures can better stimulate people's curiosity, and their public extension is more approachable and communicative than traditional public discourse, making it easier to stimulate the interest of foreign netizens. On the other hand, the acceptance of public discourse is an important aspect for subcultures to break through the closed circle. After entering public discourse, the "killing line" has been endowed with broader social significance. It has not only become a conceptual bullet to expose social problems in the United States, but also a conceptual symbol for people in many countries to express their life experiences and social emotions. The theoretical sublimation of this deep meaning has given subcultures more lasting vitality. In short, the breaking of the "killing line" is a microcosm of the transformation of subcultures into public discourse. The movement of circle culture towards public discourse requires precise responses to social psychological needs, emotional foundations to break down circle barriers, and the completion of discourse reconstruction in the process of dissemination. More importantly, in international communication practice, the concept of originality is an important lever for enhancing international communication capabilities. The precise entry of the "kill line" into the reality of American society has attracted attention from multiple fields and has important implications for enhancing international communication capabilities and discourse power. Author: Ye Jun (Associate Researcher at the Institute of Journalism and Communication, Chinese Academy of Social Sciences)