I should just buy KOSDAQ 150 on Monday

Director Al has emphasized so many times that 666 is the entry point starting from July that I've memorized that number.
On Friday, it dropped exactly below that level,
making it a very tempting entry point,
but since KOSDAQ is an unknown territory for me, I hesitated and didn't buy.
After getting burned by panic buying theme stocks of loss-making US companies,
I haven't even been looking at things like KOSDAQ.
Maybe I'll try to gradually invest 500 at a time over the next two weeks.
Or should I just buy Jeju Semiconductor?