Jonghyun like IU and s know since he's so obvious. But Jonghyun also know that IU is so oblivious about love. It was midnight when IU remembered she promised that she would call Jonghyun, so she called him. It started with just a casual conversation and then Jonghyun asked her to sing him a lullaby. When the song was finished there was a silence and it made IU thought that Jonghyun had already sleep. She said goodbye and about to disconnect the call but then Jonghyun said

When Heechul wants ice-cream He gets ice-cream, Or not.