Go Back Couple Season 1 Episode 11

The petition for the director of the university begins to gain momentum. As the campus is getting together to promote his resignation, Jin Joo worries about the director’s son, Nam Gil. Ban Do tries to find out how he got to 1999 and how he can get back to 2017. After much research, he figures it out and runs to Jin Joo to tell her what he figured out.