Lee Seokmin had everything. A loving husband, a beautiful daughter, an amazing best friend and a sweet family. But one fateful night Seokmin meets with an accident which leads him to forget his 12 years of memories. How will Seokmin's close ones react to this? What will Joshua do when he gets to know that the love of his life has forgotten him completely? Having a closed one who's facing memory loss is never easy. Join Joshua and the other seventeen members in their journey of bringing back the beautiful memories their beloved Seokmin has forgotten.