In the novel, it was explained that Dani's dad and Yeoryong's dad are a perfect combo when making friends. Dani's dad is the sociable high energy guy while Yeoryong's is the serene and calm type. Dani's dad is the one who initiate conversations and lead the party and if the other person is not good with high energy type, Yeoryong's dad is the moderator. In any case, it's because of this combo that they can make the person they just met feel as if they're homies