If you're looking for a solid and serious story-line about aliens and immortality, don't read any further. This isn't the drama for you. However if you're looking a generic and occasionally creepy love story with the badly developed backdrop of aliens and immortality, this might be your big break. Maybe. YWCFTS is the perfect example of a drama/show that lures it's viewers in with a promising and somewhat unique concept that gradually gets watered down throughout each episode until you don't even remember what the original goal of the drama/show was and by then you just kind of have to accept it. + Cheon Song Yi // If you're looking for female lead who isn't quite written like the rest, Cheon Song Yi is your girl! I wouldn't say she's perfect but her character has the right appeal and ability to keep a viewer interested. - Shin Sung Rok // Shin Sung Rok being cast in YWCFTS was a big mistake in my opinion. He wasn't utilized enough. You've got a man with such talent and extensive credentials in the theater and the best that you can give him is a mediocre and halfheartedly written villain. He had too much appeal, even overshadowing Kim Soo Hyun in my opinion. However because of the fact that the drama/show was just another generic love-story, his character itself didn't get the treatment that it deserved. I would of liked to of seen his character in another drama, something more serious. - YWCFTS doesn't choose the typical route of having the leads having an awkward encounter and hating each other for half the series and then suddenly getting put into a forced love-line. No. Instead you're getting this pedophile-esque story about a full grown man who can't seem to get over an underage girl. Not just once but in two whole generations! Because lusting/casting a full grown women would be too normal. you know? Break that status quo. - Lee Whi Kyung & Yoo Se Mi // If you haven't been swayed by the level of generic yet, there's more! Park Hae Jin is cast just like 70% of any other second male lead. You've got the 'nice guy' who genuinely believes that he should be the man of choice because...he's nice. However like many other leads, he's excessive and borderline delusional. And to contrast that, you've got Yoo In Na who like 70% of any other second women lead, was turned into a bitter and 'bitchy' woman. Because. second male leads get portrayed as 'nice' 'sweet' and second female leads are portrayed as scheming and jealous. Her character lacked depth and sincerity while Whi Kyung lacked reality. Overall, if you've got a star studded cast anything can and probably will become popular. Whether or not that popularity is deserved or not, I'll leave that up to. Personally, I'd suggest watching it for hype value but nothing else. You've got a generic story-line and lukewarm characters, nothing new.