Both succesful idols who fell in love with each other named JEON JUNGKOOK from the boy group "BTS" and CHA Y/N a "solo idol" They are dating for 3 years.. But that was in the past Y/n have to come back in US because her grand father was having a heart disease and she needs to be there beside her grand father without telling jungkook about her sudden disappearance Without jungkook knowing why Y/n dissapear he thought she was cheating and leave him behind he was very sad And Jungkook make the biggest mistake in his life he was dating Y/n's Best friend Karina because karina was flirting with him and make him fall for her which she did Jungkook get deja vu whenever karina did some things which remind him of him and y/n doing the same thing which he likes it After 1 year Y/n came back to korea feeling sad and devastated, she was shock about the news that her best friend was dating her boyfriend or should we say "ex boyfriend"