What criteria are used to determine the order in which the genres of a drama are listed?

What criteria are used to determine the order in which the genres of a drama are listed? There are cases where multiple genres are listed for a single drama. What is the basis for the order in which these genres appear? For example, the drama "Sunjae Eobgo Tweeeo" is categorized under six genres: Feel-good romance, Romantic comedy, Comedy, Fantasy, Music, and Romance.