I'm a wall for your graffiti

Yes, I am a wall.
Get angry, and talk these sh*t as you like, while I just stand still silently.

Yes, I am the wall.
Fall in love, and write down your name and your lover's on me, while I just stand still calmly.

Yes, I am that wall.
Paint me with your colour make me happy, but as time comes, that colour fades away, and you let it be, while I just stand still, cold.

No, you don't know anything about me.
You don't know how does it feel to hear your anger.
You don't know that how much I suffer with this.
You don't know...

I just a wall for your graffiti, so paint me as you like, but please take care of this colour that I like.
And I just stand still, loving you.