My Vampire System (WN) - Chapter 2500 Feeling blood

Ham Dani, a normal student whose hobbies were to read novels.

The first time they met they had battled fiercely, just for a mere bunch of herbs. She needed it to save people, and he wanted to use it to save his own life.

“Let go of it, or you will die.” The man’s violet eyes were cold and sinister as he said in a low voice.

She held on tightly to the base of the herb and pulled its roots right out of the ground, before she turned her eyes back with a crafty smile. “It’s mine now. Snatch it from me if you can.”

When they met several years later they were no longer on opposing sides in hostility. In order to repay the debt for having stolen the herb back then, she went on to miraculously cure his body’s condition, relieving him of the inhumane torment that wrecked at his body day and night. He was amazed by the godly skills in Medicine she possessed and his heart went on to fall irrecoverably head over heels in love.

- Description from novelupdates

This novel is also known as I Possessed a Demon Sovereign

Chen Luoyang felt that something was wrong with his transmigration. After transmigrating, he possessed the body of the highest expert in the world, the Master of the Demon Cult, addressed respectfully as the Demon Sovereign.

Generally, aren’t supreme experts the ones that leave behind a wisp of their soul behind and occupy a new body of some miserable low-level youngster then they go on a journey of revenge and make a comeback?!

Or perhaps it would be transmigrating into a miserable youngster’s body and obtaining a cheat slowly walking the road to becoming a God?

But why did his transmigration seem wrong?

Now my environment is full of big shots and I feel like I’m going to be exposed!

- Description from Novelupdates

Mizuno Eiji, a siscon high school student, receives the worst news from his older sister: “I have a boyfriend now.”In order to identify the man who stole his sister, he follows her on a date and… sees a suspicious figure watching the two of them as well.That person is Hasegawa Aoi, his classmate who is famous for hating men despite being a beautiful girl!“I can’t believe you are actually a brocon.”“I never thought you are a siscon.”In order to make their beloved sister and brother to break up, the two of them formed a mutual relationship and went on a date as fake lovers while following the brother-sister couple… Aoi kissed Eiji on the cheek.“You’re the only one who is… special.”Brocon x Siscon, two people who shouldn’t be able to get along is actually a perfect match…!?