However, the pair rekindled their romance, exchanging many messages through a smart-phone application.
They would allegedly meet for sex either at the complainant's home or at an Epsom motel and during one of those rendezvous the complainant had suspicions Qi had filmed the romp.
Mr McMullan said she never consented to that and things came to a head in September, 2012, when the woman confronted the defendant and told him she wanted to end the relationship.
He allegedly threatened to post a sex tape online.
The complainant's daughter is expected to give evidence about noticing Qi change the profile picture on the smart-phone app to a half-naked photo of her mum that looked as though it was a still from a video.
The woman, who has statutory name suppression, hastily arranged a meeting at the motel.
"There they had sex again but on that occasion, she'll tell you she didn't want it to happen. She was concerned if she didn't, Mr Qi would publish the actual video," Mr McMullan said.
By mid-2013 the pair allegedly had sex several more times before the complainant approached police.
Mr Qi told police he had never made an "intimate visual recording" and no evidence of such footage was found when the phone was analysed.
"It'll be for you to consider whether or not that video was taken and used to make her have sex," Mr McMullan said.
He believed the jury would be convinced of Mr Qi's guilt "from the moment you see the complainant in that witness box".
The trial, before Judge John Bergseng and a jury of eight men and five women, is expected to last a week.
