One of my cousins lived in Singapore for several years. The software company he works for is based there. They transferred him to Pomona to had up their U.S. operations. He says going to the LA area from Singapore is like being transferred to a 3rd World city.
It is impossible to figure someone out complety even after many years. The only way to truly know any person is to meet their family. Are they together, loving, Christian? How do they treat each other? Those relationships will tell you everything. This “rule” applies to any culture.