From Corpse to Crown: Reborn as a Mortician in Another World - Chapter 12: An Uninvited Guest

Harry was just an ordinary young man—until he stumbled upon a hidden world where the strong reign supreme, and Cultivation is the way to power.But fate had greater plans for him. Granted a God-tier system, he soon discovers a terrifying truth—his path to power lies in slaying beasts.[Congratulations, you have slain the Deathless Dragon.][You have reached Elemental master Realm][Congratulations, you have slain the Lion Emperor.][you have reached celestial sage realm.]While others were busy cultivating for years to level up.Harry was killing beasts.“You beasts are nothing but free exp”With each kill, his Cultivation increase, his abilities evolve.But Humans are not the only race in the vast universe, Earthlings got in fight with Dakis that gets strong by eating humans.Will Harry lead the Humans to victory or will get devoured by a daki.

Su Ran, a music prodigy, woke up transmigrated into a book.

At that point in time, the main story arc in the book had already been completed. As a villainess female supporting character, not only did she need to take over the original owner’s pitiful life in poverty, she also gained an instant son right at his rebellious period.

Ten or so more years from then, the son would turn into a twisted, evil villain. He would appear in one of the extra chapters to pick on the male and female lead’s children.

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Su Ran: Son, you shouldn’t be too outstanding.
Su Han: Why not?
Su Ran: ’cause you will be killed.

Su Ran: Son, would you like to learn music from me and become a zen, little fairy boy who only needs to drink dew.
Su Han: No, I want to go into business so I can support you.

- Description from Novelupdates

Su Jianan was marrying the love of her life. It all seemed picture-perfect, except for a few catches. One, it was a marriage of convenience. Two, she would be divorced after two years.

Being able to see into people's past has no real appeal for the teenager this story is about, letting him use it only as amusement and to show off when he was drunk.Never watch into someone's past beyond a superficial level.Never try to find out more than you should.NEVER. EVER. LOOK. INTO. THE. FUTURE.But everything changed the moment he was forced to look into the future, was forced to investigate a murder, and was forced to make the acquaintance of the victim's twin brother('s fists).The more time passed, the more it appeared that the primary reason for this murder wasn't a local problem, but a global one.This single, marred corpse was the beginning of a threat that would shake the world.(MC looses a screw when he enters the prison)BL, first-person view; MC is shuo (perhaps even a reversible couple); love interest falls in love first; both MC and ML are straight, mutual bending, Enemies to Lovers