So to make it short guys, the plot is all about two sisters, the famous one (pink haired girl) the real Hae mi, while the one who's in amnesia is Hae soo (Hae mi's sister). Maybe in this story they'll switch lifestyles like hae mi will be hae soo, and hae soo will be hae mi. The clue here is the pink hair girl is hae mi while the black hair is hae soo.
A masterpiece ༎‿༎