Christine Kuo is once again cast in the spotlight, with rumours of her secretly dating her 40-year-old diving instructor, Stephen Au, the owner of Diving Adventure School who is also already married.According to an article in Asian Pop News, an insider revealed that Christine gains weight easily and therefore went to learn diving after she heard that it helps reduce weight.The insider said, "Stephen wanted to teach her and always treated her like a sister. However, everyone found it strange after hearing that she wanted to be personally coached by Stephen."Recently, Stephen and Christine were spotted together after diving class going for a meal. Someone asked about their relationship and was chided by Stephen to mind their own business. Hence, everyone could guess what was going on."Also, tabloids claim that after a promotional event of her new drama, 'A Great Way to Care 2', Stephen was spotted waiting for her in a car. Stephen reportedly gave Christine a cup of coffee and was photographed chatting and smiling with Stephen.When Stephen's wife was asked if she knew of his relationship with Christine, she was very shocked and was not aware that they knew each other.