Lighter & Princess Episode 12

During the volleyball final exams, Li Xun's spinal injury recurs, so Zhu Yun takes him to the hospital. She meets his older sister, who tells her the truth behind his spinal injury and why he was expelled. Li Xun helped a friend change his high school grades so that he could buy an expensive liver cancer drug for his mom. His mom passes away, and he is expelled from school. Though Zhu Yun tries to convince him, he does not want to get surgery for his injury. (Source: frankly at MyDramaList)