Son Ye Jin

Leaning on each other through thick and thin, a trio of best friends stand together as they experience life, love and loss on the brink of turning 40.

Yoon Se-ri is a beautiful heiress and a leading fashion businesswoman in South Korea, and she meets North Korean military officer Lee Jung-hyeok, when she is swept up by a wind storm and accidentally crashes in North Korean territory while paragliding.

Yoon Jin-A is a single woman in her 30's. She works as a supervisor at a coffee company. Yoon Jin-A is an easygoing person, but she feels empty inside. Seo Joon-Hee is the younger brother of her best friend Seo Kyung-Sun. He comes back to South Korea after finishing work abroad. Yoon Jin-A though he was just a childish guy, but he appears different to her now.

Jeon Jin-ho is a straight guy who pretends to be gay in order to become a roommate to his female friend, Park Kae-in. His hobbies include organization and ironing, and he's known for his stoic poker face. He's a stickler for cleanliness, but he also has a talent for figuring out a women's feelings. Kae-in is very trusting even though she has a habit of being betrayed. However that doesn't stop her from giving people the benefit of doubt and Jin-ho is no different. How will Kae-in react when she finds out that her gay roommate is not actually gay at all and that he has fallen for her?