Im using VMOS so i'll explain only from my knowledge.
Open the game, then minimize it.
Open GG, set to the game (Eldrum), then change memory range to O (others)
Start the scanning exp points when you earned it at prologue (wartime flashback), Dword with encrypted value ticked.
Or,
You can do that with existing save game, just scan your gold with same settings, Dword with encrypted value ticked and set the memory range to O (Others),
But you need much gold in order to find the value since you need to scan-decrease/increase gold-rescan again,
I'm sorry with my poor explanation, im the person with "I'd rather showing you how to do it than explaining step by step" type.