니 자지는 잠겨있고 나만 열쇠를 쥐고 있어

Today's your lucky day.

Because today we are going to be committed to one another for life.

Your commitment to me is to wear this forever.

And my commitment to you is to hold the lock and the key in the power of my hands.

So you're going to wear this as long, well pretty much throughout your whole life.