There are rules that a couple must follow, one of them being never to mention about one’s ex boyfriend or girlfriend. However, 2PM’s Woo Young did not follow this rule, and had to feel bad about it for his artificial wife Park Se Young throughout the episode of MBC entertainment program “We Got Married Season 4” which aired on January 18, 2014. On this day’s episode of MBC entertainment program “We Got Married Season 4” Woo Young sat down in front of the piano to loosen up the nervousness of the first meeting and attract the attention of his wife Park Sae Young o the artificial marriage. Woo Young said, “I will play a song for you. It is a song I made for my ex girlfriend. It is called ‘This is love.’” Park Sae Young said, “Thank you,” and added, “But what made you think of your ex girlfriend?” In the individual interview, Park Sae Young said, “To be honest I did not feel bad about it anything, but it would have been better if he did not mention it at all.” Woo Young in the interview said, “I think I was crazy,” and attracted a lot of laughter of the audiences.