Q.mosquito shoo
Why do the plants start turn to brown and die when I bring them inside?

I think Mosquito Shoo is a particular geranium variety:
https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm
There are several reasons a houseplant might turn brown: watering problems, light level problems, diseases and insects, and other issues. See these articles:
https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm
https://www.gardeningknowhow.com/houseplants/hpgen/desperate-houseplants-dealing-with-common-houseplant-diseases.htm
https://www.gardeningknowhow.com/houseplants/hpgen/botany-911-first-aid-for-ailing-houseplants.htm