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@Gordon, thanks to your instruction, I could successfully reduce the file size. It's now 420kB for Korean and ASCii.
At first, it didn't work and the file size was too small, 17kB, so I took a look at the unifont-15.1.05.png image and I found that the range for Korean in the fontconverter.js was wrong. The line #701 should be replaced with

"Korean":  {range : [{ min : 32, max : 255 }, { min : 0x1100, max : 0x11FF }, { min : 0x3130, max : 0x318F }, { min : 0xA960, max : 0xA97F }, { min : 0xAC00, max : 0xD7FF }] }, //0xAC00 was 0xDCB0

Thanks.