How to say "I love you" and you are beautiful in Korean?
These are questions that I want to know how to say to a special woman in my life. Can anyone who speaks Korean help me? Thanks.

Question

How to say "I love you" and you are beautiful in Korean?
These are questions that I want to know how to say to a special woman in my life.  Can anyone who speaks Korean help me?  Thanks.

Answer

I love you:
Casual : 사랑해 - saranghae
Polite : 사랑해요 - saranghaeyo
Formal : 사랑합니다 - saranghamnida

You are beautiful
Casual : 넌아름다워 - neon areumdawo 
Polite : 너는 아름다워요 - neoneun areumdawoyo 
Formal : 너는 아름답니다 - neoneun areumdamnida

So/very : 너무 - neomu
Really : 정말 - jeongmal
너는 너무/정말 아름다워요
You are very/really beautiful

Pretty is 예뻐요 - yeppeoyo

Answer

1. I love you.
- 사랑해요. or 사랑합니다.

2. You are beautiful.
- 당신은 아름다워요 or 당신은 아름답습니다.
(너는 아름다워요. This is okay but  If you said '너' anybody, people will upset to you.)

Answer

Let me try^_^
사랑해요/ 사랑합니다. I love you.
너는 아름다워요. you are beautiful.
리사 씨는 정말 아름다워요. Lisa is really beutiful