Masses of the six quarks were calculated by layer based on the boson-field theory. Most of the values are close to them of the standard model, however, the values in 4D field are vastly different from them of the model even if the error is taken into account. It suggeststhat there is something more in 4D field. The theoretical mass of an up-quark is about three times larger than the actual figure. On the other hand, the actual mass of a down-quark is about two times larger than thetheoretical one. This means that the mass of an up-quark may be under pressure to moveto the down-quark. According to the boson-field theory, there is the mechanism that makesit possible. That is, dark matters are able to play such a role. In the process, dark matters interact with an anti-neutron or an anti-proton, and a graviton is exchanged between the two darks as well. The mass of ordinary matters continues to move step by step to the dark side in the process. Really, the theoretical sum of an up and a down quark is slightly larger than the actual one. The lack of mass strongly supports the hypothesis.For now, the only place is considered as a black hole where an ordinary and a dark matter can encounter. If the black hole itself does not let its mass from the dark side out, ordinarymatters will continue to disappear in the universe.