It's not that. He realised his mistakes and want to make her daughter happy...Thirty years later, after getting verbally slapped by his daughter, the man finally tell her what she wanted to hear. Better late than never, I guess...
Totally agree, she’s been a good daughter from since she was born, obeying her parents to please them, to hinder herself on voicing out what she wants and who she likes, at her age now, seeing Xiaoen giving the smile to someone she never seen before truly hurts her, frustrates and regrets of what she could’ve she done and said years ago.It's not that. He realised his mistakes and want to make her daughter happy...
Also, she didn't want to hear this, she wanted to be accepted as she is, by her father.