Could you recommend a novel where the protagonist traveled back to his childhood and joined an assassin organization?

The protagonist transmigrated and became a child. His family couldn't afford to eat and sold him. It was actually an assassin organization. They even considered that they couldn't run away. They only wanted to save their lives, but there were all kinds of funny things. In the end, every small character was treated as an expert who pretended to be a pig to eat a tiger. It looked very easy and funny. He remembered a plot where a group of children were locked up and given a knife to kill each other. However, the main character wanted to keep a low profile. The others killed each other, and in the end, he walked out of more than a hundred of them. He was treated as very powerful...
The title of the book was similar to I'm Really Not an Expert. From the reader's point of view, it was very easy and funny. It was a well-written novel!
I'm asking for the title or author's name, not the current [I'm Really Not a Master], a novel from around 16 years ago. beg
I'm begging the big boss to provide clues.

Answer 1

The protagonist of "The Trash Prince and the Killer Concubine" traveled through time to become the famous daughter of the Prime Minister's Estate in the capital. She was originally a modern assassin, but after traveling through time, she became a member of an assassin organization. The plot of this novel revolved around her emotional entanglement with the unfavored prince of the current dynasty. I hope you like this fairy's recommendation. Muah ~😗