Thanks for the love!
The park fuck you mean with the restaurant manager? You have to go to the Eastern Medicine shop and ask Thuy [What gift will help me cozy up with my boss at the fast food restaurant?]. Follow the instruction in the story - there won't be any instruction in objectives - and you'll reach that scene.
I'm toying with the idea of making a new game right now. However, it won't happen until after I finish with the best friend story.