MTL - My Future Diary Can’t Be Perfect - Chapter 372 non-existent person

It was in the year 2800 of the Midgard calendar. Back then, there was a Overlord who once reigned supreme and had reached the very brink of subduing the world.

His Royal Highness the King of Han, who was afraid of the dark and ghosts and loved to cry, has always been the good baby of the princess.
Until one day, His Royal Highness the King of Han found a book in the bookstore…
Picture book?
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Search keyword: Protagonist: King of Han, Princess of Han

- Description from novelbuddy

Yin BiYue has made the worst purchase ever. After transmigrating countless times into the bodies of canon fodder villains, he buys a ‘Fiend Halo’ from the Rebirth Company, supposedly the best aid for an up and coming final BOSS!

He’s ecstatic to finally get a villainous role where he won’t die after just a few lines, if any at all, and is raring to become the best opponent a protagonist will have… However, why was everyone looking at him with pitying eyes? Why was the protagonist rushing over to help him get out of his crimes? Most importantly, why was his ‘Fiend Halo’ just making things worse?!

Meanwhile, the intern salesperson at the Rebirth Company discovers that he might have accidentally sold a prototype White Lotus Halo to a certain villain…

- Description from Novelupdates

Ning Zhi transmigrated into a female supporting character who ran away from her wedding. The original novel was a fluffy book on the love between the male and female leads. The cannon fodder female supporting character, who had also married into a prestigious family, was caught while trying to escape her marriage which had led to her difficult days in the prestigious family. In addition, her husband was autistic and, for the sake of pursing true love, she made a tragedy out of her own life. Recalling the awful ending of the female supporting character in the novel, Ning Zhi expressed that she would never try to run away from her marriage. What was wrong with having globs of money? Or was her husband not cute enough?