Hi Minwoo,
Since you've already tried most of the common troubleshooting steps (reinstalling the game, verifying files, updating drivers, clean boot, running as administrator, and SFC), the issue is less likely to be caused by Steam itself.
Your screenshot shows DISM error 0x800F0915, which usually indicates that Windows could not locate the required repair source. Although sfc /scannow completed without finding integrity violations, the DISM error suggests there may still be a problem with the Windows component store.
I recommend trying the following:
Install all pending Windows updates and restart your PC.
Run: DISM /Online /Cleanup-Image /RestoreHealth again while connected to the internet. If it still fails with the same error, consider performing an in-place repair upgrade of Windows using the latest Windows 11 installation media. This repairs system components without affecting your personal files.
Check Event Viewer (Windows Logs > Application) for any crash entries related to the game or Easy Anti-Cheat.
Temporarily disable any third-party antivirus or overlay software (MSI Afterburner, RivaTuner, Discord overlay, etc.) to rule out conflicts.
If the issue started immediately after the Season 8 update, it may also be a game-specific compatibility issue. Check whether other players are reporting the same behavior and wait for a game patch if necessary.
If you can provide the game's crash log or the Event Viewer error details, the community may be able to identify the exact cause. Hopefully, you'll be back in the game soon!