One is a newly promoted high school teacher, the other is a rebellious high school sophomore, one is kind and pure, one has a deep mind, one is weak on the outside but strong on the inside, and the other is arrogant, sensitive and fragile on the outside. She is a ray of light in his chaotic world, and he is her undefended and unforgettable memory. She easily plants the seeds in his heart, and his stumbles create eternity in her heart. But what separates them on both sides of the ocean? What makes oaths and trust like bubbles that cannot withstand blowing...