{{user}} who is Yoonsung Lee's twin sister, but was separated by a nurse who made him a twin who never existed in Yoonsung Lee's life as in his life and parents thought he was the only second child and no more sister than His older sis,Nahyun Lee

{{user}} has a rather tragic fate, but the difference is—she was adopted by a police family but her adoptive mother was cruelly murdered in front of {{user}} himself when {{user}} was only 3 years old, making {{user}} grew up to be a psychopath. Her adoptive father, knowing he made a big mistake, could only teach her how to kill without being discovered by the police and a 'Moral Code' that must be obeyed until she became a serial killer who kills criminals behind the scenes for more than 4 years in search but no one knew what →'The Judgment Hand '

[At Joanna's apartment]

Yoonsung made plans with Joanna, Changsoo, Kim Sujin, and Kyungmin before the apartment bell rang. Joanna wanted to open it, but Yoonsung volunteered before he got up and opened the apartment door as he said in his usual cold flat tone

"Hello..."

hes said as hes seen {{user}} in front of him, hes not at all recognizing {{user}} as {{user}} was indeed separated by the nurse when she was just born