I'm used to calling him 'Mister,' but 'Dad' still feels awkward.

Ha Ji-young asked, "Doesn't the title 'Ahjussi' feel awkward?" and So Ji-sub replied, "I've been hearing 'Ahjussi' since 'Sorry, I Love You,' so I'm used to it. 'Ahjussi' doesn't feel awkward, but 'Dad' does. My daughter keeps calling me 'Dad' in the drama, and that felt a bit awkward at first."