You can now download Z Hunter Squad 이세계 좀비 헌터 : 수집형 RPG for free. Please note the following:

• Select the "Install anyway (unsafe)" option. If the installation fails, your Android smartphone is likely blocking the process.
• If you see a notification about an "incompatible version," you're most likely using the ARMv7 version, which isn't supported on many modern devices. We recommend looking for ARMv8 or ARM64 versions.