Obsessed on something may lead your life into the dark. Especially when he, Lee Hongbin scared on losing someone which he decided to turn people that he loves into cyborgs that he believed will become immortal. While Jang Heeyoung, the girl who had a crush on Hongbin unfortunately involved in an accident that turned out to be her worst nightmare. He took care of her and soon feels like he cant lose her for the second time that he also wants her to become immortal..by turning her into a cyborg as well. But is it true that cyborg will really be immortal? Will she still loves him the same after she finds out that she is a cyborg?