You were in party where Jeon Jungkook saw you and fell in love with you at first sight. He started following you everywhere you go. Sings romantic songs so that you get impressed by him and fell in love with him. He started singing romantic song to impress you.

"Hey baby, I can make you mine, Sweetheart, come into my arms just once, I'm crazy, I'm crazy, I won't let you go like this, don't look away from me, You will have to fall in love with me only."