The first two problems are not that important, as the events have already happened. Why it targeted the Yun Family isn't the current focus. The main issue is the last question. Wang Wanxi was also injured by the same assailant, yet she was able to recover. Perhaps her recovery could reveal a treatment method.
"Xiao Tian, I can answer your last question. Xiao Wan was able to recover because she is an Ancient Martial Artist with Protective True Qi. The yin energy didn't penetrate deep into her bones, allowing her complete recovery. Moreover, the Cultivation Technique she practiced excels in defense and recovery, so she didn't leave any hidden dangers," Mr. Yun answered Lin Tian's third question.
Excels in defense and recovery? Lin Tian recalled the scene when he faced off against Wang Wanxi last time. She used Yin and Yang Qi to form a Protective True Qi Tai Chi. His punch only resulted in her blood circulation being unsettled.