The way babies learn is that they connect visuals/expressions/feelings to sounds. They don't just listen to people speaking non-stop, people are showing them a bottle, mimicking taking a sip and then saying "Milk?" or "Drink?", so that's how they connect and learn the words.

If you're just listening to the language without any additional connections, you will maybe get better at pronounciation because you're familiar with the "flow" of the language. Once you start learning words in other ways, all the listening may also help your listening skills.

But unfortunately I'm pretty sure you won't be able to learn the language just by listening..

I commend your effort.

I tried the same, and I quickly found out that listening without knowing what you are listening to does not help at all. You pick up a word here and there, but what good is it if you don't know what they are or can't use them? I did gain one skill; I could tell Korean accent from other languages. But producing correct sound was a different story.

I heard that you could learn things even while you're sleeping. So in korea, in the contrary, i saw some mothers just turning on the english radio or tapes while their baby's sleeping. 

And I think, if you want to learn the language by listening like that, you at least should know the basic things. (Structure of sentences, grammar, words) 

Think about this : you don't know anything about Chinese, for example, and you are listening to chinese radio everyday. Do you think you could understand anything after a while? I don't think so. It would be chaotic. However, if you know some words and basic structures of sentences, you could be like 'oh! This word! Ah, this person is asking about this!'.  

I saw your profile, and you're from the philippines, right? Tagalog and Korean is really different. So if you study first, and keep listening, I think you would improve your korean soon!