the Japanese MV is cuter, and the song sounds more natural in this language as well.

the korean version

English Translation:
I cant go back to that time
That I spent alone with you
I can still picture
Those spontaneous smiles and things you did that I loved

You taught me something important
Every time we were together
And I learned to wish
For another persons happiness

I didnt think there was such thing as eternity
But I sure felt it when we made that pinky promise
Well never see each other again
But youll always be in my heart

Why did I let go of your hand
After Id held it so tight?
Thinking like that wont get me anywhere
But its OK to do it sometimes

If I erase everything, even the fact that we met
This loneliness will go away too
But in spite of it all, I can say
That Im glad I met you

That night we made a pinky promise
That even when something sad happens we wont forget our smiles
There are times when I feel like giving up
But Im sure Ill be able to smile tomorrow

The moon looms in the sunset sky
It blurs
When I think of you
But I can smile now

I didnt think there was such thing as eternity
But I sure felt it when we made that pinky promise
Well never see each other again
But youll always be in my heart

That night we made a pinky promise
That even when something sad happens we wont forget our smiles
Well never see each other again
But youll always be in my heart
I wont forget your smile