The heroine is a restorer of cultural relics in the Forbidden City. When restoring a diary of the Republic of China, she often dreams of the owner of the diary, a young man who sacrificed his life for the country. She drew her dreams into comics and unexpectedly became popular, but a mysterious man came to her door: "This is my grandfather's diary, why do you know his secrets?" The male protagonist is a descendant of a martyr, and he suspects the female protagonist of stealing family historical materials. During the investigation, he discovered that even the family did not know the details of the heroine's dream, and the last words said by the young man in the heroine's dream before he died were: "Wait for me, I will marry you in the next life." DNA testing showed that the heroine was actually a direct descendant of the young man's fiancée, which was an agreement that spanned time and space.
