By KATE TAN

Police are investigating the bizarre disappearance of an international student after videos of the man pleading for a bitcoin ransom were sent to his father.

Chinese student Jingwang Ye, 20, had been studying at Sydney's University of Technology before he was reported missing on Friday.

According to the Australian Emergency Assistance Association Incorporated (AEAAI) Mr Ye’s father received disturbing messages, including videos, from his son’s WeChat account.

MOJO News has obtained one of the videos.

During the short clip, Mr Ye can be seen blindfolded by black tape that has been wrapped around his head. His face appears to be stained with dried blood. 

In the disturbing video, The 20 year-old pleads for help.

“Dad, they require me to ask you to cooperate with their boss,” Mr Ye says.

Mr Ye’s account then sent another message threatening Mr Ye’s father. 

It read, “Your son is now with us. If you don’t want him to be in trouble and go home quickly, just do as we said. Contact this email. You must remember, this email is the only way to contact us”.

Mr Ye’s father reported his son's disappearance to police. 

The police have searched Mr Ye’s apartment in Kogarah, New South Wales, but found no trace of the student.

In a statement for Mojo News, an NSWPF spokesperson said officers are “investigating reports of a missing person”.

Mr Ye’s father sent several emails to the address, begging the unknown person not to hurt his son. 

The person then asked Mr Ye’s father to pay 80 bitcoins for Mr Ye’s safe release. 

When converted, 80 bitcoin amounts to more than $1.2 million. 

“We were just an average Chinese family. Please pity us,” Mr Ye’s father wrote in an email to the kidnapper. 

The missing student is 1.7 meters tall and weighs around 80 kilograms. 

Mr Liu urged anyone with information to contact the AEAAI.