The purpose of this study was to examine the character of Yeonghae Revolt from Lee Pil-je’s point of view in order to find the truth. The key contents according to this are, first, a series of things that Lee Pil-je worked hard to meet Haewol Choi Sihyeong to give legitimacy to his armed insurrection, and second, traced the actions of Donghak people who participated in the uprising led by Lee Pil-je. Third, in order to clarify the character of it, the researcher reviewed the materials from the religious denomination and the government, and examined the movement to vindicate the founder’s innocence and official seals, the relationship between the Donghak people and the non-Donghak people, including the correlation between blue color costume and red color costume. In the meantime, the history academia has named Yeonghae Revolt as ‘Lee Pil –je’ Rebellion’ because of the concept of ‘Rebellion’, and it is said that Lee Pil-je’s revolt was one of the strengthening of the people’s power as social contradictions intensified in Joseon. It was understood as a phenomenon or evaluated as a transitional stage before developing into the Gabo Donghak Peasant Rebellion. Relatively recently, as data related to the uprising continues to be discovered, research results requiring various interpretations are accumulating. However, the study that referred to the data of the Donghak orders and the study that referred to the data of the government are looking at Yeonghae Revolt from a different point of view. Most of the studies not only evaluate Lee Pil-je as an individual, but also give various interpretations and names to the actions he led, such as insurrection, armed insurgency, rebellion, Donghak’s first movement to vindicate the founder’s innocence, and the first successful modern civil revolution on the Korean peninsula etc. In fact, the definition of terms or names for a series of events in historical research not only reflects the researcher’s personal perspective and viewpoints, and the multilayered perception of history derived from various conditions at the time the research was conducted, but is also a great responsibility of the individual researcher. It is a difficult task to follow them. Prior to hastily defining the nature of the revolt, this study suggested that in order to approach the truth of the revolt led by Lee Pil-je, more neutral data should be discovered and a careful reexamination, and the correlation should be required between the cause of the revolt and the day of the revolt.