personally I never really watch dramas where the girl and the boy were like siblings and they grew up to fall for each other (ex.21,25. go ahead) but I started to watch this one and I don't regret it one bit!!!! The story is amazing and the way they show the emotions and how their story connects through the OST ,the objects used in the drama and their past is amazing they connect everything together so you know how special their relationship really is and how deep they are into each other's lives all the things the main lead gives to the girl all have a story behind it and how their relationship was at the moment and how it grew (ex.the dog when she was in HS to the bracelet when she was in uni) they show how their relationship grew with such good emotion that it feels like you're the one in their place it's amazing!!!