A 'leftover lady' (refers to unmarried women over the age of 30) meets Song Yi, a talented man for whom she has had a crush on for years. To get closer to Song Yi, Su Man gives up her own promising future just to work with him. Despite her efforts, Lu Licheng, a man with whom she has had several conflicts, becomes her superior. Su Man treats him like a thorn in her side, yet he develops feelings for Su Man due to their interactions. Just when Su Man and Song Yi's relationship gets on the right track, unforeseen events occur as Su Man and Song Yi's past romances slowly surface.
十年前,蘇蔓(張鈞甯飾演)和「籃球一號」即宋翊(賈乃亮飾演)是同校學生,宋翊是蘇蔓的學長。宋翊在校期間是個品學兼優和籃球技藝超群的人,蘇蔓因此愛上並默默暗戀著他。宋翊在籃球場上曾經對蘇蔓說「我在清華大學等你」。後來宋翊考上清華大學管理學院,而蘇蔓也在那之後沒有了宋翊的消息,但他一直深深影響著蘇蔓的一切。十年之後,蘇蔓成為了一家會計事務所的總經理,而此時此刻宋翊從美國歸來,並入組麥古投資公司即將成為總監,而該公司的另一投資總監為人稱「少帥」的陸勵成(鐘漢良飾演),偶然之間蘇蔓與閨蜜的惡作劇讓其與陸勵成在街邊相遇,彼此留下了不好的印象。後來蘇蔓得知宋翊即將進入麥古公司,並在報紙上看到麥古公司招聘文員,蘇蔓毫不猶豫「辭職」(實際上早期沒有辭職)會計事務所,投入到麥古公司當起了員工,隨後三人在麥古公司面臨了一連串問題,蘇蔓也徘徊在初戀與陸勵成之間的愛恨糾葛當中。