Abstract: The view of the Standard Model on the β decay of neutrons through weak interaction is that neutrons break down ‎to form ‎protons P and weak bosons W^- and finally into protons‎, electron and anti-electron neutrinos. The three ‎quarks (U,d,d) that ‎compose neutrons are joined by strong interaction, so bonds formed by strong interaction ‎supposedly cannot be broken ‎by weak interaction, which is far weaker than strong interaction. Nevertheless, ‎neutrons do decay. Further, the three ‎quarks (U,d,d) that form neutrons are fundamental particles, and it should ‎not be possible for other fundamental particles to ‎emerge from these three fundamental particles. Nevertheless, not ‎only does (U,d,d) change into (U,U,d), but electrons ‎and anti-electron-neutrinos, which are fundamental particles, ‎also emerge. This must not have a double meaning. As shown ‎here, there are multiple contradictions in weak ‎interaction of the Standard Model.‎ In this paper, weak interaction is mediated by the π‎-ons group that results from ‎the working of strong interaction step 1 ‎that was described in a previous paper and acts on the nucleons group ‎‎(‎‎P‎ ‎,P ̅ ‎‎,n,n ̅ ‎ ‎) that resulted from step 2. In other ‎words, at the point immediately prior to the emergence of weak ‎interaction, all the particles that existed in the universe were ‎used in order to make weak interaction emerge. The ‎weak interaction in this paper refers to the strong interaction bonds ‎composed of neutrons and ‎π^±‎-ons first being ‎dissolved by strong interaction. As such, the reason why neutrons change to ‎protons is just because the ‎‎d-quark of ‎the neutron is replaced with the ‎U‎-quark of the‎ π^±‎-on.‎