How long does the effect of domestic fillers last for the sunken under-eye area?

I am currently in the stage of looking into various options to get filler treatment for the sunken areas under my eyes.

I heard that you need to be careful when choosing products because the skin under the eyes is so thin, but since imported products are a bit expensive, I was drawn to cost-effective domestic products.

If anyone has received treatment with domestic fillers for the under-eye or upper cheek areas, could you please let me know approximately how long the effects actually last?

I would like to know from your personal experience whether it quickly falls out and returns to normal after about 6 months, or if it tends to stay stable for nearly a year.

Since I am spending money to get fillers injected anyway, I want to plan the procedure with an understanding of how long the results last, so I am seeking advice from experienced practitioners.