这是一部改编自韩国电视剧《蓝色生死恋》的电影版本，由于俊熙（焦睿饰）的淘气，导致恩熙（赵露思饰）与俊熙的亲妹妹欣爱（孟美岐饰）被调包互换，也让两个女孩子有了不同的命运，恩熙成了俊熙的妹妹，而欣爱则生活在了别人家，真相终于在有一天被揭晓，二人又重回各自的家庭，恩熙和俊熙不舍得分开，可又无可奈何

多年以后，恩熙和俊熙都已经长大成人，意外的相遇让二人之间的感情发生了变化，彼此的情缘相伴，成为情侣也顺理成章，但因为二人曾经是兄妹之情，这使得他们的爱情之路变得有些坎坷，连恩熙有时都在扪心自问，他们之间到底是亲情多一些，还是爱情多一些，俊熙是自己的哥哥，还是爱人，带着这样的想法如同给爱情设置了一道屏障，让他们时常会痛苦到无法自拔，这或许就是命运的安排吧。

This is a movie version adapted from the Korean drama "Blue Life and Death", due to Junxi's (Jiao Rui) naughty, Eun Xi (played by Zhao Lusi) and Junxi's younger sister Xinai (played by Meng Meiqi) were swapped, which also made the two girls have different fates. Enxi became Junxi's younger sister, while Xinai lived in the Enxi and Junxi are reluctant to separate, but there is nothing they can do

Many years later, Eun Hee and Jun Hee have grown up, and the unexpected encounter changed their relationship. It is logical for them to be lovers, but because they used to be brothers and sisters, this made their road to love a bit bumpy. Even Enxi sometimes asks himself, is there more family affection between them? Love is more, Junxi is his brother, or lover, with this kind of thinking is like setting up a barrier for love, so that they often suffer so much pain that they can't extricate themselves, maybe this is the arrangement of fate.