Eric Nam had some fun poking fun at Jessi's Korean language skills on the April 15 airing of 'Duet Song Festival.' 

Jessi was giving her thoughts on her team, and said, "There were many ballad stages last week. But this week it's very obvious (she said 'Dang-yeon-ha-da' which means 'obvious' instead of 'Da-yang-ha-da' which means 'diverse')," making people tilt their heads in confusion. 

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That's when Eric Nam politely corrected her, "It's 'dayanghan ('various').'" Jessi, ever the feisty gal, shot back at him, "Who do you think you are?" The MC's took Eric Nam's side, reasoning, "Eric Nam is better at Korean." Jessi, realizing her defeat, only said, "So you're good, huh?" It's okay Jessi. At least you can rap better in Korean!