[Ahem, it's a brother article. The story is quite ups and downs.
Xie You and Xie Ran are two brothers. Xie You was abandoned by his parents in the countryside and lived with his grandma until he was 10 years old. His grandma passed away and his parents came to pick him up. However, his father did not recognize him as his son and lived together as an "uncle and nephew". Xie You, who was introverted, did not like to communicate with others.
Xie Ran was raised like a treasure by his mother, so that he later developed the domineering character of the eldest young master.
Therefore, Xie Ran naturally attacked. Ahem, no more spoilers. You'll have to read it yourself next.