continuous grub rescue after installing grub in logical partition

Hi, I have some problem in installing grub and wants your help..

My ultimate goal is to install linux based OS on MBR disk which windows 10 is already installed.

I made two additional partitions(logical) for linux OS(One for OS(ntfs, later ext4), the other for ISO(fat32, for istall OS))

Using grub2win, I installed grub on windows10. (/boot/grub is on ISO partition)

After rebooting grub worked fine. It showed two menu entries. Windows 10 & Installing OS(ISO partition)

Installing OS included installing new grub to OS partition. The problem occured...

Grub rescue appeared.

OS is booted after I set prefix/root properly and insmod normal in rescue mode.

As long as I know if i install grub and update grub, this problem should be resolved but it did not. grub rescue keep appeared when I reboot.

Since this trouble didn't appeared in primary partition, logical partition seems to be problem.

But grub manual told me, grub works in logical partition too... and couldn't find any special options(arguements) for installing grub on logical partition

I could change the grub installation code during linuxe base OS installation, so I wish I could get some hints or possible problems regarding this...

Thanks!! sry for short english