On the January 26 installment of 'Immortal Song 2', DAY6 made their first appearance. When introducing themselves, they simply greeted everyone with simple hellos which begged the question of why they decided to go with regular and simple greetings. Sungjin spoke, "We actually tried out different kinds of greetings before but we thought basic/normal greetings fit us the best."

While talking, the rest of the guests burst out into laughter as they didn't expect Sungjin to have a dialect. Dowoon then spoke, only to have even more dialect than Sungjin which made the entire studio laugh once again.