"饰男主角的演员" can be translated into English as "the actor who plays the male lead" or simply "the male lead actor".
"The actor who plays the male lead" clearly specifies the role and the performer, emphasizing that this actor is the one taking on the main male character in the production.
"The male lead actor" is a more concise expression that directly refers to the actor playing the principal male role.
Both expressions are commonly used in English-speaking contexts to describe the actor who portrays the main male character in a film, play, or other performance.