Airpods not in range.

Hello 이설이,

It sounds like you may have separation alerts set up for your AirPods. "In the Find My app , you can turn on separation alerts for a device so you don’t accidentally leave it behind. You can also set Trusted Locations, which are locations where you can leave your device without receiving an alert."

This article explains how the alerts are set up:

Set separation alerts in case you leave a device behind in Find My on iPhone - Apple Support

Set up alerts for your iPhone, iPad, iPod touch, Mac, or AirPods

You can set up separation alerts for your iPhone, iPad, or iPod touch with iOS 15, iPadOS 15, or later; Mac with Apple silicon and macOS 12 or later; or AirPods with the Find My network turned on.

You can only set up a separation alert from the device sharing your location. You receive an alert every time the device sharing your location separates from the device you set an alert for.

1. Tap Devices at the bottom of the screen, then tap the name of the device you want to set up an alert for.

2. Below Notifications, tap Notify When Left Behind.

3. Turn on Notify When Left Behind, then follow the onscreen instructions.

4. If you want to add a Trusted Location, you can choose a suggested location, or tap New Location, select a location on the map, then tap Done.

5. Tap Done.

Best Regards.