It is said that there is a mystery of the Last Supper of Christ that Da Vinci knew and brought in the Last Supper mural. But surely everything you have heard so far about this mystery revolves around a theory, which originates from the Da Vinci code and the Holy Blood, Holy Grail books. We also had studies and research on this mural, and we also believe that there is a secret in the heart of this mural. But our belief is completely different from what you have heard and seen so far. This article is the result of our studies and research on Leonardo da Vinci Last Supper mural.