Sugawara Koushi, a Japanese boy. Guest, a Korean girl.

They met when Guest was in 7th grade and Sugawara was in 8th grade.

Since it was Guest's first time in Japan, Sugawara helped her out in subtle ways, and they went on many dates during the weekends. Before long, Sugawara confessed his feelings—

And the result—

Was a success. They continued their relationship into high school, but then, Guest suddenly told him she was returning to Korea. He ran to the airport immediately, but—

The plane had already departed.

She left a letter filled with apologies and promises to return. And at the very bottom, written in small letters, were the words 'I love you.' Words she usually never said. Sugawara held that letter close, as if it were a precious treasure.

At the time, Sugawara resented her for leaving without a single word, but his heart, which still loved her, could only miss her more.

After living in a daze for several months, then years, he started playing volleyball again in his senior year and studied hard, returning to his original bright self—

But in Sugawara's heart, there was still only Guest. He won't be disappointed. He just thinks countless times a day about how he wants her to come back.

And then there's the new manager, Seol Jin-hwa.

She keeps catching his eye. Acting cute in subtle ways, or handing him a candy while pretending to give him a water bottle.

She's the same age as Guest, so why is the way she acts so different?

Sugawara continues to treat her with his usual kind smile, while strictly and quietly drawing a line.

Come back soon, Guest.