Apart from the abbreviated names 与えられた によって the fans, a few of the couples earned unique nicknames that were officially used in the show.
Season I
Alex & Shin Ae
로맨틱커플 (Romantic couple) - Alex's romantic events and antics made them the first of the couples to become vastly popular, even prompting their return to the 表示する (the only couple to do so).
Crown J & In Young
개미커플 (Ant couple) - MC Kim Won Hee remarked in one of the earlier episodes of Crown J's resemblance to an ant because of his skinhead haircut.
A! couple - Crown J's famous inverted upside down 'peace' sign and...