I guess the "Call me Dad" is a custom in China. It means that you acknowledge that person is superior to you and have to be respected. That's why being a "Dad" is more of a claim for power, rather than quenching weird fetishes hahahahahaha
Comment by Happy on Salt Friend - Chapter 29: On the first day of school
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I read this in another manhwa that these "Call me Dad" moments are normal in China. That's why our MC gets angry when they want him to call them " his Dad"