Of course, I already did it. but no effect.
Maybe I think my problem comes from the cause of AMD CPU(Ryzen 5 2600), because docker works very well on my other intel i5 computer (same OS, win10 ver 1903)
I figured out hyper-v manager doesn’t installed when I enable the Hyper-v service in Windows Features and restart. I don’t know why that manager didn’t installed.