Mini Game with virtual NPCs

I ever played a game where there's a mini game inside which requires you to hire a team of virtual NPCs to work for you. First, you will be give a field. The different types of field will grow different resources. Say, a crop field grows crops, a mine field gives out ores and so forth. It's just another set of resources mostly for siege equipment or home furnitures. Though some are unique resources for crafting. The field can be upgraded/levelled up to unlock new resources type. It however somehow works like UO housing. You need to regularly refresh/take care of the field or else it will decay. You also need to pay the NPCs regularly.

The NPCs are wanderers. You can examine their talents (stats) to decide whether to hire them or not. You can also replace existing ones with a more talented worker. Occasionally a hero type NPC will join you to speed up the harvest. It's a bit like planting in UO, it gives out special resources but you have to stay in game very regularly.

How do you like the idea?