When I Was in Qin, I Used My Sword to Save People

As a student of Western medicine in the 21st century, Qi Yan said: When he traveled to the Qin Dynasty, although there was a system around him, it made him very distressed. Because he has forgotten the plot. Secondly, the system actually said that it had chosen the wrong host, so it could only provide services for one year. And to use the system, you need to gain merit after saving people before you can use it. Then the problem comes - no medicine, no conditions, no equipment, "How can Western medicine save people in this era? Waiting online, urgent!!!"