He looked at her for ten thousand years and loved her year after year. He loved her long black hair, her bright eyes, and the way she looked back at him and smiled in her school uniform. He loved everything about her and accompanied her as a friend. Later, she went abroad for further study and promised that they would be together when he returned home. He was ecstatic. He regarded this as an agreement and waited for her year after year. He loved her all his life.
Concept: The male protagonist has been deeply in love with the female protagonist all his life, and he will love her forever.