After an Immortal Used Me to Test Medicine, I Rose by Laying Low

[No System] [No Transmigration] [Ordinary Protagonist] [One Female Lead]

A famine leads Chang Sheng's father to sell him to an immortal for five dou of rice.

From then on, he becomes a lab rat for the immortal's experiments.

Chang Sheng is terrified of dying, so he survives and lives on as a monster.