<Ul> <Li> Um Ki - joon as Hong Baek - kyun (34 years old) </Li> </Ul> <Li> Um Ki - joon as Hong Baek - kyun (34 years old) </Li> <Dl> <Dd> Ji - ah's ex-boyfriend who is a world - renowned genius robotics professor and is the creator of the android named Aji 3 . He created Aji 3 based on his ex-girlfriend, Ji - ah . </Dd> </Dl> <Dd> Ji - ah's ex-boyfriend who is a world - renowned genius robotics professor and is the creator of the android named Aji 3 . He created Aji 3 based on his ex-girlfriend, Ji - ah . </Dd>

Jo ji a i am not a robot