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