Valkyrie's Shadow - Chapter 11Winter’s Crown: Act 4,

Ever since she transmigrated, she was blessed with an inbuilt anti-poison detector.

Beep beep – What? Her father’s concubine was evil and her half-sister was vicious?
Beep beep – Ah! She was in an arranged marriage and her husband did not love her?

Who cared? She could kill those evil creatures instantly with her high intelligence.

Her unparalleled beauty attracted countless suitors and her popularity topped the charts. No one was immune, even the emperors and princes were all captivated by her…

- Description from Novelupdates

The beauty and the taboo existing together.Unattainable and unacceptable.An existence only to be admired from afar.A hero of legends but a also a girl of tragedy.Shining like a star in the sky, all alone, forever…-But that’s too sad isn’t it?Our MC, an ordinary middle aged man, is an author that wrote books and after pouring 2 years of hard work in a book, his hardwork finally bore fruit as his book got the second prize in the regional awards.A fruit that he couldn't eat.Why?Because he along with hard work, he also poured his piss somewhere he shouldn't and died.Exactly how?Read the prologue, and you will find out~But of course, that's only the start, as the next time he woke up...He was in another world.

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

After reincarnating as Zhou Xuanji, the prince of an empire, he thought that he would be able to live a worry-free life of luxury. He did not expect to be involved in a rivalry with the Empress herself, who forced him to escape from the palace.