I'm relatively new to korean dramas, so naturally I began watching ones similar to Heirs with typical young couple love. When I heard about this drama, I thought, "Eh, aliens? No thanks" I somehow got myself to watching this, and it was NOT what I thought it would be. I thought it was going to be all sci-fi and strange alien-human interaction, but I WAS SO WRONG. I literally went on a marathon and finished this in 2 days. From the beginning, the pace was perfect as it established Do Min Joon as someone who planned to leave Earth with no feelings, but through meeting Cheon Song Yi, he changes his mind. Their love is almost like a fantasy, but so real because of Do Min Joon's longing to stay with her. Seriously, their love was the sweetest thing ever. I love how there was always random hilarious moments, especially the first half of the drama. By the second half of the drama, I was literally sobbing every episode, but that's not a bad thing. The producers really know how to get at your feelings. The ending, I won't spoil it, I had no problem with. The plot line got me hooked to the very last second and I never felt like I could predict anything. The killer aspect was amazing and actually contributed a lot to multiple character developments. I tend give all 10's when I love a drama this much, so....biased ratings maybe? Lol