Even the Evil Dragon Has to Sign a Contract of Betrayal.

I, Rune, a good evil dragon of the 21st century, was called to collect debts today. The damned brave man led a group of magisters carrying two-meter-caliber gun barrels. He had no choice but to sign a prostitution contract if he had no money. Oh, the great legendary magician Zhou Tai took in this poor, weak, helpless evil dragon like me. I could only reluctantly accompany him to travel and work.