"I killed myself" in TOWN in HC mode

Dear Blz tech support team:

Yes, as title, my HC char was died for “killed myself” in TOWN in HC mode.

I can’t describe how shock and frustrated I am. Since it seems not possible to send screenshots here, please check the latest lv 66 char under my BN ID. Maybe you shall see the message as I see in “Fallen Char” : slain by UNKNOWN KILLER