It was my a long waited drama . I liked it trailer basically after watching the trailer I liked the concept . Now connectivity of two world through small piece of meteroite neither any novel nor any video game . As well they go through to eachother world may times so drama showed both era .
Starting of two -three episodes were interesting because nobody was understand her ,she tried to explain the situation that she didn't belong this world but the male lead and his bodyguard thought she made stories to save her. The drama went smooth till when he went to her world and again he came to his world and that time her brother also went to his world and then female lead ,her brother , male lead and his body guard altogether again came to the present time . Then except her brother all again went to the past time . So till here story went smooth , afterwards it looked liked the story was stretched unnecessarily and this made the drama bored . Literally afterward I watched some episodes in fast-forward mode and finished it . Ending was good.
My recommendation would be if you don't have anything to watch then go for it.