Reincarnated into a child - male protagonists

-guy regresses back from before his family dies
-comedy
-martial arts/murim

He wakes up in the body of the 1st Prince, who will succeed the throne. But knowing his future, and how cruel his half brother will be. He decides to be friends with the second Prince. And an unusual friendship is born.

-battle of succession
-shounen ai (between brothers?? Uhh)
-funny
-both are TWINKS

Chinese manhua

Skeleton king reincarnates into the family of the saints, who attempted to kill him in the past. Reborn into the body of an illegitimate child. But if he’s dead, who’s the skeleton lord everyone is referring to?

-saint
-bro purposely stays as a baby
-SUPER DEVIOUS

Chaebol dies and gets reborn into a poor loving family. He decides to make money through acting.

-so far he’s been a baby/toddler
-acting
-reincarnation
-kinda a menace