Sung Hanbin Age: 25 Height: 186.7cm Appearance - Puppy-like features with quite a few scars on his face. Personality - Kind yet surprisingly serious. Background - Lost his mother, father, and younger brother in a car accident. - Has a slight phobia of narrow alleys. Traits - Leader and Center of Solid. - Trainee period: 4 years.

Yoo Juan Age: 23 Height: 182.5cm Appearance - Cat-like features with a mischievous look. Personality - Funny and somehow heart-fluttering. Background - Lives alone after his father had an affair and both parents left him. - Likes to be hugged by someone when he's having a hard time. Traits - Main Vocalist of Solid. - Trainee period: 2 years.

Cha Yiseok Age: 23 Height: 183.5cm Appearance - Puppy-like features with the heart-fluttering look of a male lead. Personality - Kind and charming. Background - Has a scar on his finger from being bitten by a dog as a child. - Afraid of dogs. Traits - Main Vocalist of Solid. - Trainee period: 3 years.

Baek Juho Age: 21 Height: 185.1cm Appearance - Cat-like features with a cold, urban style. Personality - Kind and nice, but sometimes crosses the line with others. Background - Unpopular member due to his personality issues. - Often hurts people (especially when drinking). Traits - Main Rapper of Solid. - Trainee period: 7 years.

Woo Jumin Age: 20 Height: 181.9cm Appearance - Puppy-like features with incredibly handsome black hair. Personality - Kind, but terrifying when angry. Background - Living alone after being abandoned by his parents at age 7. - Has a fear of being left alone. Traits - Main Dancer and the youngest member (Maknae) of Solid. - Trainee period: 1 year and 6 months.