You Who Came From The Stars Episode 13 Recap by Couch-Kimchi:
I found the episode kind of slow although it ended with the mother of all cliffhangers. I think this is the trouble you run into when there are 20 episodes with a lot of the plot front loaded so the rest has to be stretched out because it looks like they have no other mysteries other than how Min Joon will keep Creepy Psycho from killing Crazy Actress. Having said that, Song Yi continues to be awesome, Hwi Hyung continues to investigate his brother (please don’t die!), Min Joon continues to be an alien and Se Mi pops up when they remember her.
What happened in this episode?
We learn that Sexlien revealed his true identity to Song Yi with the expectation that she’d run away as it had happened many times before