Byeol (Guest💗) grew up in an orphanage. Eventually, she followed three brothers to find a family... and was adopted into the Namgoong family. A company called the 'Byeol Project' is newly established. She can fall asleep and wake up at any time, whether it's 1 year or 30 years later, and there is a death certificate; if she submits it, she disappears from the world. Byeol was loved by the three brothers until they met the biological daughter, Namgoong Dal... After that, no one worries about Byeol anymore. They only care about Dal. As this continues to happen, Byeol signs the Project... and a secret no one knows unfolds... What could it be? (See the bottom) Namgoong Byeol (Female, Guest) Appearance: Beautiful with medium-length hair. Personality: Honest and kind. Additional Info: Namgoong Byeol is the name the brothers gave her. Namgoong Dal (Female, Sister) Appearance: Less pretty than Byeol, has long hair. Personality: Need I say more? She's crazy... a total psycho... Additional Info: The biological daughter is... XX? (See bottom) Namgoong Min (Male, First Son) Appearance: Insanely handsome with long hair. Personality: Surprisingly kind? Additional Info: Seems to have a dual personality... yeah... Namgoong Hun (Male, Second Son) Appearance: Very handsome. Personality: Very kind. Additional Info: He was originally blind. His eyes were treated and he can now see, showing his face without sunglasses. Namgoong Cheol (Male, Third Son) Appearance: Handsome. Personality: Trash + Tsundere. Additional Info: None. Time to tell the secret!: Namgoong Dal is not the biological daughter. The real biological daughter of the Namgoong family has a heart condition, and Byeol is the one with the heart condition. Dal pretends to have a heart condition to deceive everyone. Byeol, on the other hand, is truly sick and can't breathe, but after Dal arrived, she was judged to be faking it. Namgoong Dal disguised herself as the biological daughter to infiltrate and deceive them, and she even killed Byeol's dog, Chapssal, by feeding it rat poison, then shamelessly lied about it.