When seven year old Joonmyun decides to make his run from the place he used to call home that day on a rainy August afternoon, he should have realized the price it will come with. But Joonmyun is still naive then, and having to think of being separated from his loved one is nothing close to what Joonmyun could have ever imagined.

As time flies by, with the remainings of Joonmyun tattered heart, he finally manages to stand back up again after the loss of his only source of happiness with the help of his new friend, Baekhyun.

But It wasn't long until Joonmyun finds another flicker of light. Another string of hope. Another source of happiness.

And Joonmyun finds it in the boy named Chen.