Chaeyeon wakes up to a box of bottles of strawberry milk infront of her porch every morning; always neatly placed, on the top of it comes a pink folded paper with a scribble of the letter H. She doesn't know where it comes from or who puts it there so her brilliant solution on dumping it though she really loves  it - give it to her milk delivery girl bestfriend, Ki Heehyun - who delivers white and plain milk, not the strawberry ones, and the girl doesn't even complain. Only then she found the girl starting to drift away from her as the days pass by.