King Lear is one of william shakespeare's four tragedies. This plot is based on the legendary story of King Lear in England. After Shakespeare's adaptation, this work has two clues. The first clue revolves around King Lear and his three daughters. The second clue revolves around Count Gloucester and his two sons. Based on the second clue, this paper focuses on the transformation process of Edgar, the supporting actor in the play, from ignorance to confusion, to forbearance and sadness, and finally to become a hero.