It's a sweet on drama,so I've expected story to be simple and sweet,but the storyline is complex,it had entirely sci fi backdrop story with concepts like time space interlap etc but handled the complex story in sweetest way possible until 13 episodes but after that they implemented emotions and thrill,finally the ending was similiar to hydel jekyyl me korean drama where story rotates around split personality disorder,but here it's about time space overlap, anyhow i loved this drama but hadn't experienced the sweetness like other sweeton dramas.