A seemingly ordinary mountain climbing trip turned out to be the trigger that subverted marriage and friendship. This amazing coincidence was completely cast into doubt after I accidentally saw the message Zhang Manni sent to my wife. Once the seeds of doubt were planted, they grew crazily. I started to look back on that mountain climbing trip, and I was shocked to realize that they had actually hired a companion to climb. My wife's calmness and deliberate explanation afterwards, as well as my best friend's anxiety, all hinted at a terrible possibility.