Here, the dynamics of marriage, children and separation are evident in Korean society. For Park Geum Ja, it is an embarrassment and shame to marry three times like Shin Yee has. However, Shin Yee states that it is even worse to have a child from a man you're not married to, like Yoon Hee has done.
These statements can also help to understand Yoon Hee's hesitation with marrying Gyu Han. She doesn't want to marry a man that is not the father of her child. However, that father (Kang Hae Sung) hurt her in many ways in the past, so she refuses to go back to him. Simultaneously, Kang Hae Sung plans to take Yoon Hee to court for custody of Jin Joo, and in the show it is implied numerous times that there is a small chance that Yoon Hee will win the custody-thus her family and friends begin urging her to marry someone else in order to reduce Kang Hae Sung's influence over the court trial.