Chapter 73: System Upgrade

Bu Ke gritted his teeth. "I don't have any mid-grade crystals. Just some green ones. You can trade them if you want. If not, fine."

It was not easy to get crystals. He did not even want to take out the low-grade crystals, but Bai Di's strength made him afraid. Coupled with Shuang Yun, who was eyeing him covetously, he could only admit defeat.

Of course, Bai Di didn't believe that he didn't have middle-grade crystals, but it didn't matter. As long as they were colored crystals, it was fine.

In the end, Bai Di exchanged 30 colorless crystals for a green crystal.

Although they were both low-grade crystals, green crystals were the best among low-grade crystals. Bu Ke reluctantly agreed to the price of 30 colorless crystals for Bai Di and Shuang Yun's sake.

Under normal circumstances, he would not agree to exchange for it without at least 50 colorless crystals.