Yeon-woo saves So-jin from Oh Sang-min, her ex. Yeon-woo tries to kiss So-jin, and Kang-hoon witnesses it. Kang-hoon warns Yeon-woo to stay away from So-jin and not to hurt her. However, Yeon-woo decides to continue with the experiment So-jin suggested. Meanwhile, seeing how Yeon-woo keeps appearing in her path, So-jin starts to believe that the two of them share a telepathic gene.