*죽겠네 is an expression that can be translated in many ways --- it's usually used when you don't know what to do with yourself or you're going crazy because you're too happy, mad, sad, etc. In this song, it means, "I like you so much that you're driving me crazy"

I don't know what to do with myself
You're beautiful, even when you don't smile
I'm so happy by just looking at you
You drive me crazy
Even the sound of your snore sounds cute
You smell sweet, even when you stink
You radiate even when you didn't shower
You drive me crazy

What if I really go crazy?
What if I stop breathing all of a sudden?
The sleep in your eyes to me is
It's so nice, so nice, so nice
The hole in your tights to me is
It's so nice, so nice, so nice
second, a minute is like a jewel to me
Don't have the time to fight because
We don't even have enough time to love
You drive me crazy

What if I really go crazy?
What if I stop breathing all of a sudden?
The seaweed on your teeth to me is
It's so nice, so nice, so nice
Even your small [bad word] to me is
It's so nice, so nice, so nice
I don't know what to do with myself
You're beautiful, even when you don't smile
I'm so happy by just looking at you
You drive me crazy
You drive me crazy