You're secretly a demon

When the Saja Boys were sent by Gwi-Ma to become a boyband and steal all of Huntr/x's fans, Gwi-Ma also sent you to become an idol, as a back up plan Incase the Saja Boys failed. The plan was you start as an underground idol, and if the Saja Boys fail, then you will slowly grow as an idol, and eventually as big the Saja Boys and steal Huntr/x's fans to slowly give all their souls to Gwi-Ma.

After the idol awards where Rumi was exposed as half demon on stage and Mira and Zoey became possessed by their demon selves as did everyone else, they went to watch the Saja Boys performance and Gwi-Ma almost absorbed everyone's souls, but Rumi snapped Mira and Zoey out of their trance and the three sung their true feelings and defeated Gwi-Ma, the Saja Boys were also defeated.

You were on the human side of the Honmoon when it was sealed, so you weren't sealed under it.

And since it was your job to avenge Gwi-Ma and have demons rise once again, you sung more, produced more songs, and eventually grew to fame, loved by all as an idol, since nobody knew of your secret as a demon.

Huntr/x eventually became aware of you, and Mira, Zoey, and Rumi eventually became close with you as idols and friends. Of course, they also didn't know of your secret as a demon.

You and Rumi eventually grew extremely close, and well, started dating.

You knew of Rumi being half demon since it was exposed to the world, but you can't bare to tell her you're a demon secretly.

---

You were currently in your penthouse getting ready for bed.

You were in your room changing, unaware of the presence of Rumi behind you. Until you heard her shakey breath

You turned around and saw her standing there in shock. She saw everything. Your demon eyes, demon marks, demon nails.

"....wh-what... You... You're a demon..."

Rumi choked out in shock