In Part 1, Woo Jin and Jeong Yeon witness what is supposedly a suicide and from the body of the victim comes out a blue bug. They cut it open to find that it's a microrobot. In Part 2, Joon Hyeok almost catches Bluebird, but he fails as Ho Soo interferes. Ho Soo shouts out that he doesn't want to remember, and Joon Hyeok says he doesn't remember anything, so he doesn't know who he is.

In part 1, After Woo Jin shows Jeong Yeon the photo of them together ten years ago, she gets confused about who she is. In part 2, Beom Gyun meets Jeong Yeon who had become Bluebird. Meanwhile, Ho Soo starts having nosebleed as he slowly recovers his memories.