Park Seo-joon as Ko Dong-man
He used to be a famous taekwondo player but decided to quit due to a painful failure. He is now a nameless mixed martial arts fighter. Later, when he falls in love with his longtime best friend, Choi Ae-ra, the memory of a frustrated romantic relationship haunted him. His past made him struggle in both career and love life.
Kim Ji-won as Choi Ae-ra
A vigorous and sassy girl. She dreamed of becoming an announcer when she was a student, but in reality, she is working as a department store employee at the information desk. She hasn’t given up on her dreams even though she is not eligible and faces too many humiliations specifically because of her rival in love, Park Hye-ran. She keeps on striving for her dream to come true.
Ahn Jae-hong as Kim Joo-man
Dong-man’s best friends. He landed a permanent position at a home shopping network, very good at choosing delicious foods. He fell in love with Baek Seol-hee, a friend of both Dong-man and Ae-ra from childhood, when they were still students. Their love last for six years, but he couldn’t marry her because of their reality. Later, while a girl from a wealthy family started to courting him, their love faced a difficult test.
Song Ha-yoon as Baek Seol-hee
The innocent and quirky girl of the group, who is working customer service at the home shopping network. For six years, her universe revolves around Joo-man, and she is extremely in love with him. Her only hobby is writing the blog.