Wow. I'm not sure what to say after reading these four volumes of absolute insanity. This is something you'll either love or hate, I think - you might enjoy the ride if you're in the right mood for it, but if you're after something that's well-plotted with consistent character development, then you'll probably develop a stress tumour from reading this. Whether you like this or not, I can say one thing for it; it definitely is not predictable, despite what previous commenters may say.
The description up there only covers the events of the first volume; from there onwards, it seems like the manhwaga simply threw in the weirdest, most illogical ideas she could think of. Normally, one would probably expect Boris to slowly defrost the Ice Queen, Yuri, but here? We get robot-selling battles, long-lost parents, crazy rivals and mafia plots rooted in random birth secrets. Don't understand? Never worry, neither did I. It made for some darn wacky entertainment, but the crucial point here is to keep your brain switched off.
The main character, Boris, is amusing, and so is the way Yuri has him wrapped around her little finger. Boy, it's a refreshing change to see a guy be the one completely devoted to the girl! He's the one who mainly experiences insecurity about their relationship, the one who mopes when he doesn't get to see her, etc. None of this is done in a very serious manner, of course. There's really no character development to speak of, though, unless you count Yuri thawing by a miniscule percentage, and their relationship doesn't make progress so much as it jumps forward.
As for the art, I can't say it's terrible, but it's far from great. I'm not a fan of manhwa art in general, but the art here didn't bother me until about the second volume onwards, when it became messy, blurry and downright off sometimes. I'm not sure whether this is to do with the original or whether the scanlators had to work with really bad quality raws (sometimes it looks like the editor abused the blur tool), but either way it isn't pleasant. At least Boris and Yuri more or less consistently look good? I suppose you can say that the art can be as insane as the story itself.