Douluo's Destiny Modification System

Xia Ling, an orphan who died of illness, was bound to the destiny modification system by chance. By changing the character's destiny, he can gain the power of destiny and make wishes to the system.
Wait, there seems to be something wrong with this Douluo?
Xia Ling: It seems that I need to do something positive. Let’s start by establishing the correct three views for Tang San.
Lou Gao, Tang Hao, and Tai Tai will study materials science for me.
Tang San, Dugu Bo, and Yang Wudi formed a medical research team.
Well done to the Imperial Clan construction team, look at the railway workers of the Elephant Armor Clan next door!
Old Baihe, I’m talking about you! Has today's courier been delivered?
Ju Douluo, how is the progress of your and A-yin's Botanical Research Institute's batch cultivation project of grass jelly?
What? The Tianshui girl group rehearsed a new dance, and the tickets were sold out again?
Many years later, when a reporter interviewed Tang San,
"Lord Poseidon, may I ask you..."
Tang San: "What Lord Poseidon? Don't talk nonsense! What kind of person am I? Nowadays, everyone is equal, how can there be any adults?" If there’s nothing else, I’ll help my fellow villagers farm.”
This article is also known as “I am cultivating immortality in Douluo Continent”, “I am farming in Douluo Continent”, and “I am leading everyone in scientific research in Douluo Continent”
Ps: The single heroine does not worship the master, does not follow the group, and should not be a licker.
Most of the settings are based on the last appearance in the original work. It is reasonable to speculate in the original settings that minor settings will be changed to make the plot look more reasonable.
ps2: Please do not make arguments based on some Honghuangliu novels or the private settings of some fans.