It was not until now that I understood a saying: In life, persistence is valuable, but persistence is also devastating. What kind of feeling is that? It's like walking on a tightrope, you can only move forward, not backward. When there is no hope, you will fall into hell. That day, you asked, is it cold in winter? I don't know how to answer this question. I just hold you in my arms, feeling your life slipping away, but I can't say anything. Is it cold in winter? I still remember that time when we were running with bare arms in the endless snow, doing sit-ups in the freezing river water, and then washing our naked bodies with the snow water. But we didn't feel cold at all, instead, our bodies were steaming like steam engines. I still remember that you would sink so deep into the snowy mountains with every step you took, but you still laughed so happily.