I want to show a real material on one of the objects intentionally in the hidden line mode is it possible?
No. It’s all or nothing for scene settings. You could do a composite image with a couple of image exports or with stacked viewports in LayOut.
A quick example in LayOut:
You could remove the materials from the rest of the model or use FredoGhost from Sketchucation to do that.
Relying on a bug as part of your workflow might work but is probably not a great idea for the long term. If they fix the bug you’ll have problems. We’ve seen quite a lot of that already since the clipping bug fix.
yeah, wasnt sure if i should ‘cross-post’ it.
Just found it kinda funny one problem could be a solution for another…
Yeah. Interesting idea. Probably not good from a future-proof point of view, though.
It’s gone 
No need to do that.