"What If" is the story of two neighbours Peach and Smart. Since they were young, the two took care of one another. They have special feelings for each other but choose to keep them to themselves, unsure if it's true or not. When Peach attends university, they start to drift apart. Peach has his new community, new friends and girls. The growing gap between them makes Smart understand his feelings toward Peach. He decides to take the exam to attend the same university as Peach. The story also follows their dream of being singers. (Source: WeTV || Edited by MyDramaList)