The One Who Wouldn't Die-A Hunter X Hunter Fanfiction

It was a typical contract. Get in, kill the target, get out. Nothing out of the ordinary. The Zoldyck's eldest could handle such an easy task. He could even do it in his sleep. Besides, the target was a simple, fragile child. What more to this could there be? A lot. After all, appearances can be deceiving. Can't they?