金圓圓是個190斤的高二女生，受盡嘲笑和白眼。 某天，班上來了一位轉學生金佳人（中韓混血兒），被全校男生奉為女神。這位女神很高冷，唯獨對金圓圓敞開心扉，兩人後來成為無話不談的結拜姐妹。
在一次意外事件中，金佳人命喪黃泉，由於有心願未了，她回到人間成了遊魂，打算借用金圓圓的軀體去完成向男神道早安的遺願。礙於情面，金圓圓一次次妥協，但金佳人並没有就此打住，反而一次次得寸進尺，她們的姐妹情面臨很大的考驗，金圓圓會如何抉擇？是繼續妥協還是……
Being overweight for an Asian girl in senior high school can be a miserable existence. But when the Chinese-Korean beauty, Jin Jiaren, transferred to Jin Yuanyuan's class one day, Yuanyuan's life changed. She became Jiaren's best friend and confidante. They became soulmates, as close as sisters, until Jin Jiaren's accidental death.
Initially, Yuanyuan was pleased to allow Jiaren's ghost to use her body to fulfill her unfinished wish. But, Jiaren took greater and greater liberties, testing their friendship to its limit. How will Yuanyuan resolve her dilemma?
