Films consisting of several protagonists and multiple plots have been increasing and getting more popular in Korea. However, traditional theories of narratives cannot analyze and describe their complex structures. The aim of this thesis was to investigate narrative structures in multi‐protagonist and multi-plot Korean films. We chose to analyze 17 multi-protagonist Korean films based on the top‐ten box‐office list from 1991 to 2006 including 6 multi-protagonist and single plot films to compare their narrative structures with those of multi-protagonist and multi-plot films. We utilized the plot diagram method which describes the role of protagonists in sequences and the relationships between sequences using circles and lines through scene‐by‐scene analysis. This diagram can graphically display the presence of subplots and their associations with the major plot as a function of playing time. We found that multi-protagonist and multi-plot Korean films exhibited several subplots, in which different protagonists played major roles. According to the location of events and happenings and the completeness of narratives in subplots, multi-protagonist and multi-plot films were divided into three subtypes: the segmental multi-plot type, the satellite multi-plot type and the composite multi-plot type. Films in each subtype exhibited stable, similar topological structures of narratives. We suggest that multi-protagonist and multi-plot films demonstrate similar topological structures of narratives to those of multi-player online role playing games or real-time strategy games. To assess the box-office value of multi-protagonist and multi-plot films, we analyzed the box-office records for Korean films. We found that they were included in the top‐ten box-office list since 1998. We suggest that the annual increase in their box-office values arise from the non‐linear editing system in post‐production due to the development of digital technology and thus facilitating technological possibilities for complex plots. This study may provide us with insight into the development of integrative models for both traditional narratives and digital storytelling narratives such as multi-protagonist/multi-plot films and multi-player online role playing/real-time strategy games.