Where was the zero point of the boundary line taken?

Hello! The TV series you mentioned was shot in Beihai, Guangxi. It is true, accurate and correct. Look down there. The hotel is: seaside hotel, where Beihai Silver Beach is located. I have seen this TV. The mountain where they live is called Guantouling. Most of what I saw was the scenery of the North Sea. I come from Beihai.