So what I am understanding is that MC had a hyung whose name was Woo Hee Jae but when he was rescued from the ark and lost contact with his hyung he decided to use his hyung's name instead of his own which is Woo Ilrock? I wonder what happened to his real brother, did he die like his parents...? Also did he just say he wants to kill his younger self because he is changed after the butterfly effect or something else ? .... too many questions that need to be answered