The plot started as one usual Kdrama plot, where both the male lead were introduced as two different persona, falling for an innocent city girl. The love story of Ha Eun and Hyung Bin was exceptionally beautiful despite their uncertain future because of Ha Eun's heart disease. Their story was woven in the backdrop of 80's and it was soul-soothing to watch their devotion towards each other. When Gong Ji Chul is introduced as an abused child and the flashbacks of his horrible memories breaks our heart and was carefully portrayed. Both the men, trying to save the girl they love, made mistakes and that changes three of their life in a tragic way. The reincarnation of these three souls happen in the plot of 2020. From the beginning the story is twisted and then unfolded in a very intelligent manner. Anyone is supposed to stay hooked to the last few episodes to find out exactly how everything comes together. I would have had no problem if the modern part of the story had no Love relationship at all. but swinging the girl's heart between two guys without basic reason and then her being extremely merciful towards one(Jong Bum) and judgmental towards the other man (Kim Soo Hyuk) was not normal and looked as if it was intentionally done to justify her loving Jong Bum. The girl trying to be kind and sympathetic towards Jong Bum was a nice gesture, but her behavior towards the love of her past life and also the man who tried to protect and understand her is all way possible was horrible in my opinion. If ending could have been logical rather than exceptional one, I would have really rated the story 4/5 for sure.