The arguments are all in Mandarin.
Viewers who translated the video say the woman claims to have been fired from her job at the store, after working a few shifts, and is demanding to be paid for them.
South Australia Police confirmed they are investigating the attack.
They said officers had responded to the reports of the woman's assault at 9.25pm but said the suspect — who is known to the victim — had left the scene.
The young woman was treated by paramedics.
Reddit users were appalled at the man's behaviour.
"What a disgusting human being. This needs to make front page so he never works again," one user wrote.
"He is a piece of cr** who hits a girl and then runs away when her boyfriend steps up," another said.
"It really makes me worried. I hear stories every day of students, immigrants, new Aussies who are ESL and who are coerced or tricked into doing things by less savoury speakers of their native language because they don't know they have rights," one person commented.