SEE ALSO: Teacher will have you giggling and wowing at his dance cover of 'Me Gustas Tu'!

The teacher, named Joo Jin Seok, revealed that he is a big fan of Yerin, telling her, "It's an honor to meet you." I'm sure Yerin was honored as well to meet such a dedicated fan of hers! She mused, "From the way he did his hair, I knew it was me. Even the curls are exactly the same," bringing laughter.�

Joo Jin Seok then went on the put on a performance of "Me Gustas Tu" with G-Friend, taking over Yerin's parts and imitating every one of her moves down to the facial expressions!�

Umji praised the teacher to no end, saying, "There is an special bright expressions that Yerin makes. I was shocked that he had on the same exact expression as Yerin. He's awesome." And we have to agree. Just make him a permanent member already! �