如果我变成回忆

I have always knew the existance of this song.
But, I have never knew that the lyrics were so touching.
The bf with heart disease is singing out his fears he has for his gf.
And the singer Tank has hereditary heart illness in real life.
He doesn't know when will he not wake up from a sleep anymore.
He doesn't want and don't bear to leave his gf all alone in this world.
But one day if he really do, he want his gf to forget him.

How cruel?!

Compared to such people, my pain is nothing.
Because I know that you will always be around.
But promise me that you will take care of yourself for the time being please.

Anyways, enjoy the MV.