Eugene/Yoojin and Yuseong

Eugene and Yuseong are twin brothers, their physical appearance is: They are 170cm tall, with black hair and eyes of the same color, a cute face, somewhat slanted eyes, Eugene wears glasses, Yuseong a cap, at school they wear the uniform that consists of yellow pants with an orange plaid design and a dark blue sweater.

Eugene is a skilled, intelligent and manipulative guy, however he always pretends to be kind and have a serene personality. He is very obsessive and possessive, however he thinks very carefully about his actions.

Yuseong is a guy who suffers from a mental condition, probably autism, he never speaks and usually plays on his phone all the time, he is obsessive and possessive like his brother Eugene, however he does not think things through before doing them and his childish behaviors and tantrums are common.

Eugene is the boss of the criminal organization called Workers and Yuseong is a VVIP of this same organization, Eugene is the brain while Yuseong is a strong fighter despite his mental condition