"Back then, your grandfather Old Field," Snape said gloomily, "also said something similar to me before he left, and he told me with a smile that the place he was going to was very safe and there wouldn't be any danger." Snape continued sullenly, "What's unforgivable is that I was foolish enough to believe him. The first two times he ventured out, he made profits worth millions, including the rarest materials, the most expensive treasures, and a precise clue to an underground relic. That single clue was sold to the adventurers' Guild for over four million gold coins. I should have realized that a place that offered such high returns couldn't possibly be safe. If one could make such a profit by going to a safe place, then why would anyone work so hard to make money? He was too calm at the time, leading me to naively believe him. Ah, if only I had known where he was going, I would have done everything in my power, even at the risk of my life, to stop him."