A Korean family is still often a line through time, not only a couple in an apartment. Parents remain central after marriage. The eldest son used to live with the parents and lead ancestral rites. That pattern is breaking in cities, and it still appears in holidays and in who pays for a parent’s hospital. You will hear a classmate say they cannot travel because of family duty. Believe them. It is not a weak excuse. It is hyo, even when they complain about it.