Because This Is My First Life

Jiho faces the worst moment of her life on her 30th birthday. Her long-lasted housemate, her brother, impregnated a woman, and now she is left homeless looking for a place. Meanwhile, Sehee is in a pit because he is left alone with the burden of paying rent for the upcoming months with his housemate moving out. Horang introduces Jiho to a townhouse and moves in. From the name "Sehee," she doesn't question anything about the house owner.

After a kiss with a stranger, Jiho greets a peaceful weekend morning, but with peace comes the storm; she finds out the stranger she kissed is her house owner. Jiho is once again left without a place to stay and Sehee without the perfect tenant. They both fall into despair and get frustrated that they cannot live together simply because they are not the same gender.

To the sudden proposal from Sehee, Jiho says yes. Then she snaps out of it and Sehee also apologizes, saying that it came out the wrong way, but Jiho still feels weird about it. Meanwhile, Sooji and Sanggu reunite at an event Sooji's company is hosting. Sanggu brings up the 'one night' from the rooftop party, but it seems like Sooji does not remember Sanggu at all.

After returning home, Jiho and Sehee accept the conditions each presented and compromise, and get down to business with the two-year move-in marriage contract. The first step is to get Jiho's parents' approval! Meanwhile, Horang feels restless after hearing about the restaurant's youngest staff's marriage and sends subtle hints to Wonseok.

Jiho and Sehee send out the news about their marriage and get many different reactions. The time for Jiho to meet and gain blessings from Sehee's parents has finally come!

Sehee gives Jiho a shoulder to lean on when she tears up while reading a letter from her mother. On their way home after getting married, Jiho feels soothed, a feeling she never had before. Meanwhile, Sooji and Sanggu run into each other at Jiho and Sehee's wedding. The personal encounter makes Sanggu think he now has more routes and opportunities to connect with Sooji.