The study begins with a groundbreaking discovery in the field of English literature that took place in 2019. Claire M. L. Bourne and Scott-Warren traced the original owner of Shakespeare’s first folio, a rare book in the Free Library of Philadelphia, and found that it had once belonged to none other than John Milton. This finding was particularly significant because Milton had left numerous comments and notes on the text as he proofread it. As a result, the discovery offers a wealth of new possibilities for studying Milton’s perspectives on Shakespeare. This paper examines the influence of Milton’s notes on Hamlet and Romeo and Juliet, finding that the evil characters in Hamlet were “Miltonized” while Romeo emerged as a more independent character. Additionally, Milton’s inversion of the title of Romeo and Juliet to Juliet and Romeo reflects his views on the subversive role of husbands and wives in the play. (Suncheon National University)