Can't recommend this for those who want to play quietly alone

There are farms and dispatch missions, but if you complete them and leave them unattended even for a little while, they'll get stolen immediately. If you're targeted, you'll get stolen from every time. Maybe setting a timer would help. It's not about leaving things unattended at all; there are just many tasks. Japanese and Korean are flying around, but since the chat has a translation function, I don't think you'll have too much trouble with communication.