影片改编自郑执原著小说《被我弄丢两次的王斤斤》。 2010年夏天,高考考场上,白晓宇(檀健次 饰)第一次遇见王斤斤(张婧仪 饰),就把她给“弄丢”了。 四年后,他们在毕业季的求职人潮中意外重逢,然后相恋。 2018年,相识八年、相爱五年的他们站在婚姻的门前踌躇不前了。 他们彼此相爱却又难逃现实的重重羁绊,白晓宇会再一次 弄丢王斤斤吗……Bai Xiao Yu meets Wang Jin Jin for the first time in the summer of 2010 during their college entrance exams. However, she slips through his fingers and they don`t see each other again until an unexpected meeting during college graduation season. The pair fall in love and date, but marriage seems impossible when they come from such different worlds. Bai Xiao Yu fears he will lose Jin Jin once again like before.