A 'leftover lady' (referring to unmarried women over the age of 30) nicknamed the White-Boned Demon Su Man, met Song Yi, a talented man for whom she had had a crush on years. To get closer to Song Yi, Su Man gives up her own promising future, just to work together with Song Yi. Despite her efforts, Lu Li Cheng, a man she has had several conflicts with, became her superior. Su Man treats him as a thorn in her side, yet he developed feelings for Su Man due to his interactions with her. Just when Su Man and Song Yi's relationship went back on the right track, unforseen accidents and mistakes happened on Su Man and Song Yi's past romances slowly surfaced. Su Man, Song Yi and Lu Li Cheng's romance are tested in every way.