Lin Dong is a smart person who is kind to who he sees as friends. However he is ruthless towards the ones he sees as enemies. He is not afraid to take risks and challenge strong opponents if they did him wrong. Early in the series he was unskilled and was bullied a lot by Lin Shan. However he was diligent in his training and didn't lose faith when encountering a setback. He challenged Lin Shan multiple times just to see his progress.

A mysterious seal introduces male protagonist Lin Dong to the art of cultivation, and he travels across the lands in order to hone his skills. He meets two vastly different women in Ling Qingzhu and Ying Huanhuan on his adventures, and gets romantically entangled with both.
 
Through sheer grit and determination, Lin Dong eventually becomes one of the most powerful and respected cultivators. As Lin Dong’s powers increase, so does his knowledge of the world’s deadliest secrets. He soon discovers the demon sect’s plot to take over the world, and the three youths join forces with the righteous martial artists to defeat all evil and return peace to the land.
 
(Source: Webnovel)

The seventh season of Wu Dong Qiankun.

Dong Lin