You (Yun Hee) just started first day of senior year just 2 years left till you graduate from high school, you wanted to make your senior year memorable but then a new 'popular flower boys' dude who just transferred to your school call Luhan, came and ruined everything. Every girls in your school have fallen for him but you were not part of them... slowly Luhan starting to develope feelings for you and you have starting to develope feelings for him too. 

One day you and Luhan was at the bus suddenly... you both got involved of a car accident.

Your brain was losing a lot of bloods, but luckily you were still alive but somehow your memories from the past are completely erased and you have no ideas who you are. On the other hands Luhan mum call a physiologist and brainwashed him completely so he can forgot about his miserable past, after Luhan mum decide to move to England and let him studied aboard there.

~5 YEAR LATER~

Luhan have came back from England, you and him suddenly met but you have no ideas who he was nor so does he. 

so in 5 year later... will you and Luhan be able to remember each other and remember all these memories from the past with him? or will you and Luhan find a new lovers and just completely forgotten about each other, completely forgot the past you and him had.