A construction site is a place where dangers such as even a fall can cause injury. How can we make them understand dangerous places and work when we cannot communicate well? Also, when we tell them "it's dangerous" at the time when we feel it is dangerous, can they understand it? I felt that communication was an issue. If they get injured, it will not only be painful for them, but it will also cause trouble for the whole construction site. Therefore, I explained the work content and safety management carefully and thoroughly. Even if they said "yes, yes" or "I understand," I repeatedly checked whether they really understood, and I made sure that they were basically accompanied by a Japanese person on the construction site one-on-one and did not let them work alone. However, they grew faster than I expected. I personally think that this is due to their strengths, their "obedience," and their own efforts to understand. Reinforcement work is mainly physical labor, but they have the mental strength to carry it all day without complaining. Also, seeing the accumulation of such efforts, I think that they are all excellent human resources that I do not want to let go of.