[Spoiler] "Father is Strange" Kim Young-chul's mother's death
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Byeon Han-soo was having some drinks with Ahn Joong-hee (Lee Joon) and regretted pretending to be his dead friend Byeon Han-soo when he learned how much he missed his father. His wife Na Yeong-sil who had supported this idea, felt very sad and recalled the past.
Na Yeong-sil was a nurse and she fell for Byeon Han-soo who was taking care of his old mother with all his heart. However, he was an ex-convict for murder and couldn't make enough money for the hospital. His mother was eventually kicked out of the hospital. Na Yeong-sil was worried about them so she visited them but Byeon Han-soo had pushed her out telling her not to come back.
Na Yeong-sil was shocked but she promised to return. Byeon Han-soo was then framed for a thief and couldn't come home from work. In the meanwhile, Na Yeong-sil visited his mother but found her dead.
Byeon Han-soo was framed for something he didn't do and wasn't able to watch his mother's passing or the funeral. This is why he had to take over his dead friend's identity.