Hi. You did not inform the text to which this question refers, which makes it impossible for it to be answered. however, I will try to help you as best I can.
It is possible to see from the context of your question that you are referring to "Romeo and Juliet," which, as you may already know, is a play written by Shakespeare that depicts the tragic romance between Romeo and Juliet, the children of two enemy families. In act 5, Scene 1 of this play, we can see a moment when Romeo makes a premonition. In this scene, he dreams that Juliet meets him, but he is dead, but she kisses his lifeless lips and makes him relive. In the last Act of the play, Juliet does indeed kiss Romeo's dead lips, but he doesn't come back to life.