The background of the story is China, which is riddled with holes after the Revolution of 1911. Emotions in troubled times are always influenced by the tide of the times. In troubled times, love is a luxury, but it is also easy to come by. Just because the sun was shining brightly on the day I met you, or maybe the clatter of horse hooves passed by, and you appeared... Love in troubled times can withstand ups and downs, life and death, and without the oath of friendship, we have seen the vicissitudes of life together.