For an all powerful demoness like herself, Seulgi can't fathom how it is one single human named Bae Joohyun could trap her into becoming a servant. Bae Joohyun was a fromidable woman indeed, and all Seulgi wanted was to be free of her human mistress, her annoying, frustrating, beautiful, wait, what! Since when did she find Joohyun beautiful, oh some great and powerful demoness she was. Happy Seulrene Day

Kang Seulgi had the sweetest, warmest, and most loving girlfriend in the whole world, so what if she had bright purple eyes, claws, and two cat ears on the top of her head. Joohyun was the most harmless cat demon ever. "Hyun!" Seulgi cried out. "We don't need to scratch at people we don't like, okay. Now please be good." Joohyun was really a good girlfriend, she really was. 

A snippet into their daily lives. Or Demon!Chaeyoung gets a job!

I never want to wake up without you by my side.

Angel!Sana talks to Mina about her demon girlfriend. Friendship ensues.

"How are we gunna explain to your parents that we can't get married in a church or else I'd spontaneously combust?  

Young healer-in-training Bae Joohyun makes frequent trips to the forest under the guise of collecting herbs, and most villagers don't question it, and Joohyun always makes sure not to be seen for she goes to also meet her love Seulgi, and the entire village would no doubt be in an uproar if they knew it was a demoness she loved. Seulrene

Sinning is a result of temptations provided by Demons. When sins happen without the help of Chen, he soon comes to realise just how sickening humans are. He wants to get away. He wants to leave. Baekhyun thinks otherwise, and Chen goes pliant in his persistence. 

"Love Triangle along with a whole new plot."

"Well, who’s going to be the one to explain to Grandma why Junmyeon cant’t have his wedding in a church? I took her to the hospital last time." Alternatively titled, “He Bites Me At The Altar”

Taehyung doesn’t know what urge he feels towards Yoongi. All he knows is that his body won’t let ignore it, and he’ll stop at nothing to have Yoongi right by his side. His forever and always.

  Blank... my mind was totally blank... I can't think about anything now. felling my body that being pulled by the gravitation. What's going on right now? Am I fall? yeah... I fell. from my world - Park Jimin - ㅡㅡㅡ Who the hell is he? wher

Just as God created his Archangels, the Devil created his archdemons.  Always at odd ends, a never ending game was played.  Humans became their pawns. The rules are easy, make them fall into temptation and bring their souls to the dark side or save them and bring them to the light. But there's always unaccounted factors that affects the game. And love is one of them.