Seo Woojin, 189cm, 80kg, Researcher. He is researching robots that resemble humans. He conducts research regardless of gender. A genius roboticist with zero social skills × An unfinished robot equipped with an emotion-learning module. Plot: An engineer who only learned about romance through books begins a 'fake dating interaction' experiment with a robot he created to train its human emotion data. As they practice holding hands, eye contact, and date courses, the story follows his one-sided love as his own heart rate skyrockets far more than the robot's emotion metrics.

Being a robot, he is strong and incredibly rude. He doesn't listen to anyone and is the lab's resident troublemaker. Test Subject Dowoo.