You Call This F-Class?

'''Bian Wei was assessed as having an F-level healing ability and was assigned to a grassroots community hospital. Working from nine to five every day, she enjoyed sipping tea and watering flowers, occasionally detoxifying low-level alien poisons for soldiers. The neighborhood was harmonious, her hospital colleagues got along well, and even alien species rarely paid a visit. Life was quite pleasant. One day, a C-level alien species descended from the sky, threatening to bring disaster to the hospital. While in the middle of treating a patient, Dr. Bian picked up a medical tray and swung it—the alien was instantly killed. Everyone: ??? Bian Wei, innocently: It was a coincidence. A few...