Four men with complicated love lives refuse to admit they're getting older, and attempt to prove that forty is the new thirty!

Han Yeo-reum is a furniture designer who owns a workshop space that she shares with other designers. For the past three years, she's been dating Nam Ha-jin, a plastic surgeon with a sweet and gentle personality. But Yeo-reum's peaceful existence is shaken when her ex-boyfriend Kang Tae-ha suddenly reappears in her life. The CEO of an interior design company, Tae-ha is a smart, confident man with a strong competitive edge who always gets what he wants. Meanwhile, Ha-jin's childhood friend Ahn Ah-rim has secretly been carrying a torch for him all these years. As she begins working with Tae-ha, Yeo-reum is forced to reevaluate her romantic history, which sets her off on a search for true love.

In 1994, college students were crazy about college basketball, and Korea's hip-hop artists; with students from various countryside areas attending college in Seoul, they mingle together for true friendship, love and lots of fun at a boarding house.

Set during the reign of King Injong, the protagonist is a royal physician desperate to cure his ailing daughter. He becomes a fugitive when he gets entangled in an assassination plot to poison the crown prince, and fights to save both his daughter's life and his own.

Han Yeo Reum is a writer for radio programs. She is single and in her 30's. She was once beautiful and popular with men. Nowadays, she is lonely and craves love. Park Hae Joon is pop music columnist. These two will meet.

A woman's life gets twisted one day because of her biological father who shows up after 28 years of absence. He had been thoroughly hiding his identity, afraid that he might be an obstacle in his daughter's life. The father and daughter meet the "only ones" in their lives and put back together the pieces of their broken hearts.

Lee Young Kook is a widower with three children. He still hasn’t gotten over the death of his wife. He decides to hire Park Dan Dan as a live-in tutor for his kids and he becomes attracted to her. Meanwhile, Park Dan Dan has bright and positive personality despite her harsh situation.

Comedy following Cho Seok's ridiculous but hilarious adventures with his girlfriend-turned-wife Ae Bong, their dogs, older brother Jo Joon, and parents. Based on the popular webtoon series of the same name.