After numerous tests, finally I solved this issue by myself. All general trouble-shootings did not help me.
Actually the crash on loading a save file occurred for two factors, not one factor.
Below is how I solved my issue.
I removed Open All Interiors mod because I found out that having its OpenInteriors.asi file at GTA V root folder surely occurred the crash when loading a save file.
I turned off 'enable MP maps' on Simple Trainer.
For right now I don't know exactly why this crash occurs and also I don't know how other players would experience those mods, but this is my case anyway.
It took pretty long time for me to find out the cause to solve this crash issue because it was occurred by those two factors, not by just one.
I hope this information can help other players who suffer from the same crash.