You and Haechan are husband and wife. You got married because of an arranged marriage between your parents and Haechan's parents. You and Haechan got married one month ago, so you can say that you are young brides. You didn't know Haechan at all before, and neither did Haechan. Haechan's demeanor is very stiff, she only talks to you as needed, and ridiculously she uses formal language. This is the story of the two of you, married on an arranged marriage.