Sorry for that I can’t type in Korean right now…
I have to type in Konglish…
I finded the way to boot by not cd/usb but iso file in hard disk.
Add boot menu like below.
(Modify your /boot/grub/grub.cfg)
menuentry "Boot by Live CD ISO File" {
loopback loop color=#BF0000:1q790gy8/cd.iso[/color:1q790gy8]
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=[color=#BF0000:1q790gy8]/cd.iso[/color:1q790gy8] noprompt
initrd (loop)/casper/initrd.lz
}
Red path can be modified according to your iso file location, but don’t edit other lines.
Good luck!
Attention
In installation, don’t format the partition in which ISO file is!