Chapter 145: Chapter 138: Yin Yang Evil Pill_2

A flicker of confusion flashed across Han Yi's eyes as he voiced his doubt.

Gu Tongxuan explained, "Daoist Han may not know this, but this pill formula was purchased from the outside by my grandfather. Even the raw materials were bought together. At the time of acquisition, some of them were merely labelled with serial numbers, and it was unclear which types of medicinal ingredients they were."

"However, there is no doubt that this pill is indeed required by the Gu family."

Han Yi's confusion did not ease. Gu Tongxuan's explanation seemed far-fetched.

However, this might involve the Gu family's secret, and Han Yi had no intention to inquire. He only needed to focus on the alchemy.

Setting aside his doubts, Han Yi studied the pill formula in great detail, going over it thrice. After estimating in his mind, Han Yi finally figured out the finer details of the alchemy process.

The method of crafting required by the pill formula was quite special.

It was a compound pill.