Because This Is My First Life

It's Ji Ho's 30th birthday and the worst day of her life at the same time. She becomes homeless overnight when her roommate and younger brother wants his pregnant girlfriend to move in. Meanwhile, Se Hee is looking for a new housemate.

After Ji Ho kissed a total stranger, she wakes up to find out that her new housemate whom she thought was a woman is actually a man. Rather than the fact that they kissed, Ji Ho and Se Hee are sad that they can't live under the same roof.

When Ji Ho gets a proposal from Se Hee, she becomes confused as she doesn't know what his intentions are. Sang Goo reunites with Soo Ji, but Soo Ji has no recollection of what happened before.

Se Hee and Ji Ho decide to get married, so naturally, Ji Ho introduces her boyfriend to her family. Se Hee must impress Ji Ho's father in order to get his approval. Meanwhile, Won Seok tries to make up with Ho Rang by getting her the sofa she wanted.

Ji Ho and Se Hee's parents meet each other for the first time. Although Ji Ho and Se Hee agreed on not holding a wedding, Ji Ho's mom and Se Hee's dad think otherwise. Won Seok still can't understand why Ho Rang got mad.

After the wedding, Ji Ho feels like she and Se Hee have gotten closer. Won Seok and Ho Rang run into each other at the wedding. Meanwhile, Sang Goo gives Soo Ji a piece of his mind when he sees her being mistreated.