Where did "big head, big head, don't worry about rain, you have an umbrella and I have a big head" come from?

This novel tells the story of an inexperienced young lady, Tian Sisi, who worships Qin Ge and resolutely runs away from home and grows up with the help of her fiance, Yang Fan.

The characteristics of this novel:

The book "Big Man" depicts the lovely big miss Tian Sisi and the ordinary hero Yang Fan who is closest to Gu Long himself. Miss Tian Sisi can do nothing but get into trouble. She has always admired the great hero Qin Ge, but she will be betrothed to Yang Fan, who is not stunning in appearance. So she disguised herself as a man and ran away from home to find the right person.

Along the way, her luggage was stolen, lost with the maid, and even sold to a brothel, which made many jokes and met all kinds of strange people. After all kinds of difficulties, she finally found Qin Ge and made friends with him. But she found that the more she knew about Qin Ge, the more she felt that Qin Ge in front of her was different from the imaginary hero.

But ordinary Yang Fan also has an unexpected side. Let's follow Miss Tian Sisi in My Sweetie and watch the ups and downs of real life, the bitterness behind great heroes, the brilliance of ordinary people's humanity and Gu Long's simple philosophy in a relaxed and humorous style.