The mural of the Last Supper is drawn from Matthew 26, the Christian Bible, and depicts the scene in which Jesus prophesies "One of you will betray me" during the last meal with the twelve Apostles on the eve of his arrest by Roman soldiers. The disciples look confused, sad and agitated, and ask Jesus: "Lord, is it me?" Only Judas, the traitor sitting on the right side of Jesus (fifth to the left of the square), leans back in panic, his face darkened as he clutches in one hand the reward for selling Jesus, a purse containing thirty pieces of silver.
From the first century to the fourth century, when Christianity was just born, productivity was very low and food resources were very scarce. The main food was only mutton and bread. In the Last Supper, bread and mutton were among the food on the table. Jesus also distributed bread and wine to his followers and said, "This is my body and blood for the sin of all," so in the early days, Christians used unleavened bread or unleavened bread to refer to Jesus' body. This custom has also been used until now, and Christians still regard bread as an essential food when holding the "Communion" ceremony in the church, and eat the bread after the ceremony, and the bread is regarded as a symbol of Jesus' body.