Who said that girls and boys cannot be friends?! Maybe the people that fall in love easily but that person is definitely not kang soyeon, and obviously not shin Dongho ! They have been best friends since birth. Totally inseparable! Always stuck together like paper and glue. When they were younger they have made one promise that they planed to keep forever! "I will forever be by your side" that promise has been kept for 17 years but now they are 19, what happened to those 2 years? An accident accrued involving the two besties, Dongho turned out to be okay. But on the other hand.. Soyeon has lost her memory. She has been in a comma for almost 2 years. When she seen Dongho again, she didn't have that best fried feel for him. She accidentally fell for him! But things got a bit complicated... He has a girlfriend now.. The only one by her side is Kevin, the one who is Always there for here when she needs him. Will soyeon's memories ever get back?! Will Dongho understand her feelings or will he walk away? Will he still care about her? What happened to that promise? "Forever by your side?" Maybe ? Does that promise mean anything to them now?