Singers Huh Gak and Zia revealed how they became close friends during a recording for 'Yoo Hee Yeol's Sketchbook'.

The two talented vocalists recently guest featured on the popular music program as their duet "I Need You" released in August is still receiving much love. While on the show, the two showed off their close bond and brought laughter as they revealed the story behind how they became close.

Huh Gak started off by saying, "We started becoming close after we exchanged numbers after hosting a radio program together.... phone chatting.."

He continued, "We started talking on the phone frequently, and one day, Zia called me drunk," piquing the curiosity of the audience. He also revealed that there was a time when he was not sure if Zia wanted more than friendship as he stated, "Everytime Zia drinks, she'll call me and say 'Oppa, your song is being played at this bar', and it led me to misunderstand her feelings before." The two singers then broke into shy laughter, wrapping up the story.

This episode will be broadcast on October 13th.