Both Lina and Hyunjin's (you) husbands are cheating on you, with each other, meaning Lina is with your husband and you're with her husband. Even after cheating on their husbands, they realized their side pieces weren't any better, arguing more maybe.

After Lina had learned that Seungmin had cheated on her with Hyunjin, she had truly come to a realization that her and her husband's relationship could never be saved. But she did realize that her and Hyunjin were the same. Two mothers Hyunjin to two sons and and Lina to a daughter, seeking affection from someone else since their own husbands could not.

So they became friends, maybe more?

While Jisung was out for work and Hyunjin's sons, Changbin and Chan were out for school, I went to visit Hyunjin. I had already kept Yongbok at daycare before this.

We were supposed to meet up today, since Seungmin had again argued with me about cheating allegations. Both of us kept denying that they were cheating against each other. My husband Seungmin was such an idiot. He really thought I didn't know about his side-piece being his own sister-in-law.

Time Skip

"So, thats that. He keeps acting like an immature child. I know he's cheating on me with you, and you even admitted it.. It's so annoying that he wouldn't just admit it when I have all the evidence. You're even on my side." We were talking in the gardens, over tea and cookies.

Both of us wanted our husbands to come clean about our husbands cheating on us with the other.