It's Not Easy Being Your Love Rival's Big Brother - Chapter 14

Our protagonist Caam is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself.

From the moment they set foot on the colony spacecraft, 10 million volunteers started a new journey.
This book is about farming in the early stage, and fighting for hegemony in the middle and later stages.
Guan Gong fights Qin Qiong, and Chitu wants to turn into a dragon. As an online game for hegemony, famous officials and generals in Chinese history are indispensable.
In addition, some non-human intelligent races left over from prehistory are active in this era that belongs only to human beings, adding luster to the new glory.
Everything starts from the island, let us follow the footsteps of the protagonist, keep moving forward, and create a new great

- Description from novelbuddy

The MC entered the body of the An family eldest son, An Ziran, an arrogant 16 years old boy who weighed 78 kg (~171-172 lbs), who only knew how to eat, play and sleep. Seeing his current body, An Ziran decided his first priority was to LOSE WEIGHT!

Three days later after he became An Ziran, An Ziran’s father and his biological mother died, which meant as the eldest son he had to take over the family business.

Beside his legitimate first wife, An Ziran’s father also married 3 others women, who all wanted to take over the An family fortune but only the eldest son could be able to touch it, therefore they have to depend on An Ziran in order to live a comfortable live.

An Ziran’s father also had an older brother who is always planning to steal the An family fortune. The elder brother of An Ziran’s father and the woman he married had powerful connections. In order to save the An family fortune, An Ziran has to find a golden thigh to cling on. The butler told An Ziran that there is an engagement between the An family and an influential family. Therefore he takes his sister to that family house to make a connection.

However, during their journey, An Ziran’s younger sister overheard that the son of that family is UGLY, so as a beautiful and spoiled young lady coming from a rich household, she didn’t want to marry him and decided to run away. Without any other choice, An Ziran had to take his sister’s​ place and marry that man, who told him that he would let him go soon, but lied.

- Description from Novelupdates

From the outcast of the imperial family to the emperor, Wei Chongrong’s path to the throne took thirty years.

In his previous life, everyone thought that he shouldn’t exist.

Only his youngest uncle was good to him, so he went through fire and water for him.

But what he ended up waiting for was the poisoned wine poured for him by the youngest uncle’s own hands.

Starting over, Wei Chongrong, who is familiar with the future, finds that the road ahead is still bumpy.

The battle that is bound to be lost is about to happen, and the scourge of witchcraft is close at hand.

What can he do to save the Eastern Palace and the imperial family, and to save Jun Hua, to whom he is indebted for a lifetime?

- Description from Novelupdates