Why does Zauner cry in the Asian supermarket H Mart? How does she establish the personal, but also cultural significance of this location in Chapter 1?

Readers should recall that Zauner is often moved to tears in H Mart because the items and people she encounters remind her of her Korean mother. She worries that her Korean identity is precarious after her mother's death, since Chongmi was her direct blood link to this part of her ethnicity. Zauner also reflects on H Mart as a link to culture and family from back home for many immigrants and members of the Asian diaspora, as the food available in its aisles reminds them of home and the people they left behind.

What is the significance of Zauner's memory of eating the sannakji (octopus) at the fish market in Seoul with her mother in Chapter 2? What does this incident tell the reader about Chongmi and Zauner's relationship?