I was shocked to hear about Teacher Zhang Xuefeng's passing. I don't watch his shows very often, but I've seen some replay videos on YouTube. Sudden cardiac death is likely a heart attack. I noticed he had run marathons before, which reminds me of when I ran a marathon myself. I ran 10 kilometers in one go, and during the next ten-plus kilometers, my entire body felt uncomfortable. I gritted my teeth and finished over twenty kilometers, which felt like I came pretty close to death that time (I usually run 5-10 kilometers). I'd recommend that everyone get a smartwatch if possible—preferably an Apple brand or one that can detect heart rate and blood oxygen levels. Make sure to enable abnormal readings alerts. Human life is so fragile. As for the people you want to see in the future, go meet them if you can. Every meeting might be the last, so cherish them. Of course, health is what matters most.