Commercial advertising, as a powerful tool for transmitting commercial, cultural and ideological messages, plays an important role in representing local, national and global values. Advertising semiotics, by analyzing visual, textual and audio signs, reveals the hidden layers of the message and its goal is to discover how values are transmitted, emotions are induced and the audience is persuaded through symbols, metaphors and myth-building around a brand. This research, by applying Roland Barthes' semiotics and utilizing the emerging concepts of post-digital semiotics, emotional semiotics and brand myth-building in the era of globalization, analyzes the commercial video of Zamzam (representing Iranian values) and Coca-Cola (representing global values) in the last year to examine the characteristics between these two brands. The findings show that Coca-Cola advertising promotes dynamic visual cues such as Marvel heroes, legendary characters, consumerist and sensationalist values and creates a myth of a modern and Hollywood lifestyle. In contrast, Zamzam advertising, while being collectivist and simple, uses cues such as water (a symbol of purity and life in Iranian and Islamic culture) and strengthens national and spiritual identity. The findings indicate a conflict between Coca-Cola's global myths and Zamzam's indigenous identity. This research helps to understand cultural interactions in advertising and its impact on audience perception.