Explain the difference between 1st, 2nd, 3rd, and 3rd Omnipresent.

First person is when 당신 use terms like I and me.
"I went to the store to buy milk."

초 person is when 당신 using terms such as you.
"You went to the store to buy milk."

Third person is using he 또는 she.
"He went to the store to buy milk."

Omnipresent is like third person, but 당신 are describing everyone thoughts.
"He went to the store to buy 우유 and she thought it was a way to get out of chores."

Hope I helped!