On the October 18th episode of "Running Man", BLACKPINK members were the guests on the show.

The show's cast members were all happy and cheered upon seeing the members of BLACKPINK performing their new title track, "Lovesick Girls." Everyone was surprised when a "supposedly" 5th member of the group suddenly appeared! It was So Min who received last week's punishment. She joined them in their performance.

Throughout the show, the cast played a fun game with BLACKPINK called the "truth game," where they had to attack one another with questions, and the members get to wear cat ears that would automatically move if the person who wears it has a change of emotions or was caught off guard. The goal of the game is to make the opponent nervous and alerted their detectors.

Rosé was given a chance to ask a question and asked Jun So Min, "You thought you could replace the members during the opening dance rehearsal, right?" Jun So Min immediately denied it. However, the ears moved even if she answered no to the question. It means she was taken aback by the question.

Jun So Min was then completely caught off guard when Yang Se Chan asked her if he can get Ramyun at her house. Every Korean drama avid fans know that in Korea, going to someone's house to eat ramyun in the evening is associated with spending the night there.

Then it was Jennie's turn to be asked, and she was questioned with asked who had the messiest room, to which he automatically responded, "Lisa." And she was also asked if she thought she was the prettiest in BLACKPINK. She replied, without hesitation, "Yes." Though she may seem to answer confidently, her cat ears kept on moving. With a lot of confusion, Lee Kwangsoo then asked, "What do you keep thinking about?" and Jennie threw him off by replying, "You."

Lee Kwangsoo then asked Jennie asked if she had a guy she was interested in. Upon discovering her line of attack, she replied, "You" making Lee Kwang Soo shy. Then it was Jennie's turn to attack someone with her questions. She asked Lee Kwang Soo a question where he was taken aback when choosing between his current girlfriend, actress Lee Sunbin and BLACKPINK's Jisoo. Jennie asked, "Is Sun Bin unni doing great?" and "Who is prettier, Sun Bin unni ? or Jisoo unni ? (Knowing that actress Lee Sun Bin is Lee Kwang Soo's girlfriend.)

As soon as he heard the question, Lee Kwangsoo's cat ear emotion detector started to move, hinting that he suddenly had a change in emotions. He did not choose one among the two and explained, "They both have different charms..."

Later on, Lee Kwangsoo answered the hard question and stated that Rosé was the prettiest member of BLACKPINK, and Jennie got teased when her ears were the one that moved.

"Running Man" broadcasts as the first part of SBS Good Sunday at 4:50 p.m. KST.