Bigamy refers to the act of having a spouse and marrying another person, or marrying someone knowing that he or she has a spouse.
According to the above definition, which of the following is bigamy?
Sun married Zhou for a year and decided to divorce because of personality differences. Zhou's parents immediately took their daughter home. Half a year later, without going through the divorce formalities, Sun married another non-local woman, and Zhou also married a man from a neighboring village