But would Samsung Electronics really go as far as filing criminal charges?

First of all, the moment they file a complaint, things will become a massive issue.
The landlord would definitely be caught for forging private documents, and if there's a violation of the Certified Broker Act involved, it looks like that broker could face license revocation or business suspension.
Criminal punishment is certainly possible, but I wonder if they would go that far.
Wouldn't they just settle for something like a full clawback of the subsidies plus excluding them from performance bonuses?