"There are swallows in the north ridge, their feathers are like snow, and the fresh wind is white, they fly south with wings, and their feathers are broken, how they are, if the wind is strong, they will never leave, and they will never leave." One word determines a life, but because of a vow, he never marries, waits, and dies... He works hard to get her again and again. Love, but the same ending, Zhang Xue's time travel, she became a snow girl, she could have changed everything, but she didn't, history is history... "It's miserable, but you failed to assassinate Qin, the country forgot about it, and you slowly and slowly promised to 'never leave'."