He mistakenly fell in love with her because he didn't understand love, but because of a chance encounter, he realized that he didn't like her, but liked her.
He saved her because of his kindness and became her "fiancé", and because of her, he met her who would stay with him for the rest of his life.
Because of her, she was misunderstood as committing suicide, so a farce began for her to find the man she wanted to protect her whole life.
Who says good friends can't time travel together? We just traveled through time together, how about that? Not convinced? If you're not convinced, come and bite me!