She was taking a shower at home when she discovered she was being filmed.
A phone camera hidden in her biological father’s jeans pocket was doing the recording.
She found out midway through the shower and deleted the footage after looking at it.
Channel NewsAsia reported that the father pleaded guilty to outraging her modesty in court today.
He was 50 and the girl was 15 at the time of the incident which took place between January 2009 and March 2010. Father and daughter cannot be named to protect her identity.
The girl made a report on her father in April 2010 after she saw a school counsellor.
The court heard that the man has a diploma in computer science and had worked in the IT industry.
The hearing will continue on 5 November.