The full duet scene never actually aired on the show, however a cut was played in the background during the scene where Baekhyun was leaving the Roommate house. After searching the lyrics as well as looking at the list of BGM from that specific episode, the song appears to be an original. [DL]
I’m so fucking weird It’s like: I’m the nicest rude person you’ll ever meet. I don’t give a fuck about anything but at the same time, I care about a lot. I hate people but I want to be everyone’s friend. I hate myself but I’m completely fabulous. I need help.