First Demonic Dragon - Chapter 13 But Not For Me!

Zheng Tan somehow returns to the year 2003, turning into a black cat. Picked up from a rubbish heap by the Jiao family, he is given the name “Charcoal”, and so begins the life inside Professor Jiao’s family. Zheng Tan remembers that he was once a person, but currently his body is that of a cat. He has no way of speaking the human language, but can understand it, and even retains the thinking and IQ of a young 20 year old youth. Read along as he adapts to this new world, and somehow tumbles from a group brawl to catching a thief.

- Description from Novelupdates

In a world of power struggles and betrayal, A hero was once a loyal warrior who dedicated his life to helping his childhood friend ascend to the throne. Through blood, sweat, and unwavering devotion, he paved the way for his friend's reign—only to be betrayed the moment his goal was achieved. His life was cruelly stolen, but fate had other plans.Instead of death, he awakens in his childhood once more, armed with the memories of his tragic fate. This time, he will not be the loyal shadow of a false friend. This time, he will seize the throne himself.Yet, this is not his story.Our true protagonist is an ordinary man who finds himself reincarnated into this world—not as a hero, but as an extra. A mere background character destined to meet a tragic end, a third prince whose death will serve only as fuel for the true villain's rise. Slated to become an undead knight under the fourth prince, the last and most terrifying villain of this dark tale, he must now defy fate itself.With knowledge of the future and a world filled with scheming nobles, ruthless warriors, and an impending catastrophe, can this forsaken prince change his fate? Or will he meet his destined end, only to rise as a pawn in the villain’s grand scheme?A tale of revenge, survival, and defying fate begins now.

Three Emperors have died in quick succession. The prince whom nobody had taken notice of unexpectedly succeeds to the throne. He is quickly plunged into layers upon layers of danger. The Empress Dowager dislikes him, wishing to install a younger, more obedient Emperor. His half-brother dislikes him, accusing him of stealing the throne that is rightfully his. The palace attendants and servants dislike him, believing that he is not a true Emperor. The Child Emperor must save himself.