Fate Is Destiny, Destiny Is Determined by Man-Made

She, an ordinary girl who couldn't be more ordinary, he was aloof and arrogant. They were two parallel railway tracks, but they fell in love because of a fatal encounter. She saved him and he harmed her. What was the fate? He seeks her and she forgets him. When they meet again, he vows never to let go of her hand again, but can the wheel of fate really be so smooth?