How to make Plum Extract, Koreans like more than sugar

If building a house is a war against leaks,
Was plum extract a war against mold?
To prevent mold,
People have gone through so many stages
8 tips for my mom's plum extract!
10kg of plum
4kg of white sugar
4kg of brown sugar
2kg of oligosaccharide
0:52 tip 1
1:38 tip 2
2:31 tip 3
2:58 tip 4
4:00 tip 5, 6
4:39 tip 7
5:11 tip 8