Home app have excessive battery drain even when I have NEVER used home app before

I have been using Iphone 13 pro since it dropped in 2021 and this iPhone was perfect, until this thing happened.

I don't have any IoT thing in my home and also have NEVER used home app before, but from January (almost two months ago) my iPhone battery drained by home app background activity. At the first time, I thought I touched something in mistake to keep the home app on, so I deleted the app immediately, but it wasn't helpful. Then I tried to fix it by myself, such as re-booting, turning off background app refresh, deleting VPN, upgrade to new iOS, deleting some apps that I recently installed, but all failed. So I contacted the Apple Support, English version and Korean version, made total 2hours call in a few days, and they both said they had never seen this kind of situation before.(while I can google out many other different cases even in Apple Community)

The only thing I have not tried is RESET and tbh I don't want to try this since many things cannot be fully saved by iCloud. And now I have to put the phone on Low Power Mode 24/7 because this "home app" barely uses battery when this mode is on.

I cannot understand why I have to get through all this situation and Apple Support does not support me anything. Maybe it is time to quit iOS.

P.S. I think there is some app identified by home app is requesting some data in the background, but I am not good at IT thing and cannot figure it out by myself... Please HELP!