@Burakf 

1)  Color means nothing.  I suggest you update your drawing with the known function of each wire.

2)  No smart device will work, or even power up, without neutral.   It's a simple "go/no go" fact.   

3)  No smart device will work, or even power up, without full time power.  Not power via a traveler.  Another "go/no go" fact.   

4)  Can you connect the line and the load together at the dimmer?  Sure, so long as you don't want it to ever turn off that will work fine (so no).

As to what I see on the drawing:

A) Lets label the ports on the dimmer, but where is power coming to the dimmer?  Are you trying to power it from a traveler?  A smart device needs a full time power and full time neutral.

B) Where is the neutral on the dimmer?

FYI, some smart dimmers really only need one traveler.  The Feit works that way, as an example.  So you could, for one of those switches, steal one traveler and re-purpose it as a full-time hot line.  KS230 may or may not work that way too.

Finally, just an observation:   For testing purposes ONLY one could perhaps run a white neutral stub to a ground wire.   That's not appropriate, code supported, or etc, but it will allow the box to power up and let you test out the rest of the wiring.