If I understand what you want to do...
The cutscene will be only play once if you success the first level, even your exit the game and play again ?
If its that why not just use global value 0 or 1. Once the cutscene is played for the first time the Global Value will be set to 1. You save this global value to the ini, so you can restore the global value when your start the game. Then in cutscene you add the line :
Start of Frame
If global value X = 1 > Go the next frame (Loading 2)