which aired on the 22nd, Ma Gwang-suk (played by Eom Ji-won ... and the youngest O Gang-su (played by Lee Seok-ki) suffered from worsening hearing issues. The challenges facing the brothers ...

While organizing the laboratory as Beom-su's assistant ... that Oh Gang-soo (played by Lee Seok-ki) would be returning from military service. The scene where Gwang-sook subtly tested her mother ...