Song Sung Hae is a 16 Year old Girl came from a broken family that she wants to find.she live with her Loving Aunt and she works and study to support their financial problems Sung Hae is just poor girl leading her to work and study.She got Enrolled to a most famous and Expensive school in korea she got a scholarship there. her boss daughter Lee Min Rin is a witch in her life she would get whatever she wants. and one of them is Kyungsoo .Min Rin got Shot by vwhat you call love at first sight . And there you go Lim Jae Bin was Sung Hae's Bff and Kim Sung Rin . Kyungsoo has feelings for Jae Bin and Jae Bin does not know. kyungsoo has full of secrets including his feelings he woudnt show his feelings if he didnt want to.and thats make Sung Hae curious and really want to envestigate Kyungsoo but Suddenly Her long await family found her iys the greatest invester of the D.O Magazine which is Kyungsoo's company the father of Sung Hae agreed to invest in Kyungsoo's Comapany in one condition Kyungsoo needs to marry Sung Hae in order to Sign the contract.Kyungsoo has its full confidence knowing that the daughter can possibly wont found but if they found his lost daughter he woudnt love her just like what his father said.'Do Not Fall in Humans'.but ad the time goes by .living with the same roof ,its hard to avoid not to fall for each other.and by that Theres a action Of Developing to each other.and loving each other. and by the time Sung Hae Knows the truth about Kyungsoo's being immortal and being inlove with Kyungsoo Will she accept him and does she know what will happen in the future if she keeps loving Kyungsoo.