Instant Black and White when using Pen Tool

[sung jin woo]

When I have an image selected then I select the pen tool, the image suddenly turns into a black and white image.

[Hangman]

Hi @sung jin woo and welcome to the forums...

I'm assuming this happens when you select the Pen tool and then click a colour in the colour palette to use for you line? The way around this is to deselect the image prior to selecting the pen tool and a colour in the colour palette which you can do using the esc key.