As for why Gu Chen is now willing to write advertisements himself.
There isn't any special reason, really.
It's simply because he's out of money…
If he had more funds to hand, Gu Chen's first consideration would definitely be to directly organize an opening ceremony.
Then, he would go all out with various marketing strategies and advertising campaigns.
Guaranteeing a full house of guests on the first day of opening.
He would even create some buzz and fabricate stories to add an air of sophistication around himself.
Or he might concoct some history about the shop to stir up a sense of awe and respect from others.
Of course, right now, such things are pretty much wishful thinking.
Gu Chen doesn't even have the money to hire a server, it's just him, the sole commander.
If you add his daughter Tangtang to the equation, then... that would count as 1.5 labor forces, I suppose.