Sua and Siyeon are childhood best friends with a little benefit...they both have feelings for each other but they never told each other. Ond day Sua took the first move and proposed on Siyeon's birthday, but what she didn't know was that...it was the very day that she loose her beloved Singnie... Sua can't forgive herself because she thinks that it was her fault... Siyeon couldn't bare to see Sua sad because of her, so she came back as her Guardian Angel... She