On February 15, A Pink members Chorong, Eunji, Namjoo, and Hayoung appeared as guests on the KBS2 variety program, 'Problem Child In House'.

On this day, one quiz question asked how the well-known celebrity K-Pop fan, TV personality Park So Hyun, deduced whether or not an idol was dating or not, based on their their airport photos. 

First, Namjoo guessed, "By seeing if the idol is carrying a gift purchased from the duty-free shop," while Song Eun Yi guessed, "By looking at if one idol has the same passport case as another idol." Both answers turned out to be wrong, although Namjoo's answer seemed closer to the real answer. 

Cast member Song Eun Yi took another guess by saying, "If an idol carried off a 'Gucci' shopping bag from the plane, and then several weeks later, another idol was seen wearing a 'Gucci' item at a schedule." 

This turned out to be the correct answer! However, hearing this, Hayoung argued, "Even if they carried off a 'Gucci' bag, a lot of idols wear 'Gucci' all the time." 

In response to Hayoung's argument, the production staff explained more specifically, "Park So Hyun often checks to see if an idol is carrying a shopping bag with the logo of a brand that the idol typically does not wear, or a brand that does not seem to suit them. If the idol is carrying such a shopping bag, there is reason to believe they may be dating. Later on, when Park So Hyun sees another idol wearing the same brand item that she found unusual, she suspects that those two idols may be dating." 

Hearing this, the cast members joked, "If we ever see Min Kyung Hoon at the airport carrying a 'Victoria Secret' shopping bag, then we'll know that he's dating."

Meanwhile, the A Pink members couldn't help but react to Park So Hyun's keen deduction by stating, "This is pretty rational reasoning."