The remnant king and poisonous concubine: this palace has a system

As a black market doctor without a license to practice medicine, Kuro Jianyu sadly traveled through time.
Even if you travel through time, you have brought the most vicious system in the future century—the virus system, and you are bullied to collect various viruses every day.
The adoptive father disdains, the stepmother flatters and kills her, and the concubine pretends to be pitiful, forcing her to death one by one. I really think she is easy to bully, right? The virus system will make you lose face and die if you want to.
Hey, that prince, are you going to marry me or not?

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