I Just Want to Be Happy - S1.E18

Hyun Moo comes across his half-sister So Jin and tells her that he attacked Do Jin to prove himself to their father. So Jin tries to stop him from committing further crimes but he gets away. Ok Hee pays a visit to Hui Jae for the first time in 12 years to warn him not to bother their children anymore, but leave them alone in peace. However, Hui Jae reminds her that they are not only suffering from his sin but hers as well.