되다 = meaning of "become" 되 = root of 되다. 고 = end of word 싶다 = meaning of "hope or want" 싶어요 = honorific form of 싶다. For example, If you want to say, "I want to go" 1. go = 가다 but 가다 is a root so you should change it in a sentence to "가고" 2. want = ~~싶다. if you want to change it as a honorific form, it should be "싶어요" so complete sentence should be " 가고 싶어요" (not honorfic form is "가고 싶다") you can drop "I" but if you use "I" --> "나는 가고 싶어요" But "나는 아름다운되고 싶어요" is wrong in grammer. If you want to say "I want to be beautiful" --> "나는 아름다워지고 싶어요" becuase "아름다운" is adjective so can't use with "싶어요" together. Always, ~~싶어요 should be used with verb. for example, 가다(verb:go) + 싶다 = 가고 싶다. 먹다(verb:eat) + 싶다 = 먹고 싶다. So you should change from adjective form to verb form. 아름다운(adjective)-->아름다워지다(verb: become beautiful) I hope this will helpful to you.

되고 싶어요. is that what I would like to be. 나는 아름답고 싶어요: I'd like to be pretty. 나는 아름다운 여자가 되고 싶어요: I'd like to be a beautiful woman. 나는 부자가 되고 싶어요. I'd like to be a rich.