beta
I already find it iffy they chose to translate Moryeon's "I planned to disguise myself as an alpha" to "I disguised myself as an alpha" as it contradicts the onscreen text, which is that Moryeon was exposed to alpha pheromones for the first time with Yeju. I also dislike how the younger brothers refer to each other by first name instead of using brother prior, Seobun calling Moryeon by his name directly in the dinner scene was so jarring and made the tone vastly different as each younger sibling defers politely to their older one in original text. Now they changed commoner to beta, as in the original text they don't use alpha and omega, they say Yan, Yin, neutral etc. Neutral can also mean commoner, so Moryeon was saying we are going to disguise ourselves as two commoners after a day of work.