Since the game is designed for mobile devices – tablets and phones, you need to simulate a mobile device to play on a PC. There is a lot of software that can accomplish this task, but I offer you the most time-tested soft, which is very convenient and easy to use.
NoxPlayer – Download from official page
Step 1. Add your Google account to your device.
Settings – Add account
Step 2. Open Play Store and find Mu Origin (you can find many versions of the game, but our version developed by WebZen)
Step 3. Launch Mu Origin and wait until the game is updated to the current version
Step 4. If you have facebook or webzen authorization method, then just change the account in the game log-in window.