You drive the president back out to where the prosecutorial investigation team is assembled, and dump Park out in front of them.
"You can take it from here!" you exclaim.
Job well done, time to go get sojued up and sleep for 24 hours. But then a guy from the justice ministry shows up and hands each of the prosecutors an envelope full of cash.
"Awaiting orders, ma'am," the lead prosecutor says. The president gets to her feet and brushes off her pantsuit.
"You fools, don't let that excavator vigilante get away!" You try to fight off the prosecutors, whacking away a few with your shovel, but they pry open the door to your excavator and haul you out. It's you who goes to jail. THE END