Main •
Song Ji-hyo as Noh Ae-jung / Tan Ziyi • Noh Ae-jung is a film producer who has been struggling while raising her child on her own for 14 years. When four men appear in her life, they reawaken her sense of self. • Tan Ziyi is Dong-chan's mother and the wife of a Hong Kong gang leader. •
Son Ho-jun as Oh Dae-oh / Cheon Eok-man :A bestselling novelist as well as a screenwriter who writes for Hollywood movies, but his real self is hidden behind a veil. •
Song Jong-ho as Ryu Jin :An actor with the nickname ''Nation's Male Friend''. When he was at university, he majored in theater and film. His popularity rapidly increased. •
Kim Min-jun as Koo Pa-do :CEO of a financial company called Nine Capital. He is Dong-chan's adoptive father and is a former gangster who started a new life and earned the nickname "Robin Hood of the private loan industry". •
Koo Ja-sung as Oh Yeon-woo :A physical education instructor. His good looks and charming smile make him one of the most popular teachers at school. •
Kim Da-som as Joo Ah-rin :A top star actress.
Supporting •
Kim Mi-kyung as Choi Hyang-ja, Noh Ae-jung's mother. • Uhm Chae-young as Noh Ha-nee, Noh Ae-jung's daughter • Kim Young-ah as Kang Suk-hee, owner of SuKey Bar; Noh Ae-jung's friend and landlady. •
Baek Soo-hee as Choi Hye-jin, a first-year producer at Thumb Film Studio. • Kim Byung-choon as Mr. Wang, CEO of Thumb Film Studio. •
Jin Hee-kyung as Joo Bo-hye, Oh Yeon-woo's mother. •
Oh Hee-joon as Do Gwang-soo, Ah-rin's manager. • Yoon Seong-woo as Koo Dong-chan, Pa-do's son and Ha-nee's friend. • Lee Kyo-yeob as Director Kim • Lee Hwa-ryong as Myeong Kwae-nam, Ryu Jin's manager. •
Seo Jeong-yeon as Jennifer Song, CEO of Ryu Jin's agency Ssong Entertainment. •
Bae In-hyuk as Novel swordsman
Special appearances •
Kim Kwang-gyu as Hong Pyeon, editor-in-chief (Ep. 2-5, 16) •
Kim Ji-min as Cheon Eok-man's book concert MC (Ep. 2) • Hong Yoon-hwa as Ryu Jin's radio show DJ (Ep. 4) •
SF9 as themselves (Ep. 6) •
Ahn Suk-hwan as island resident (Ep. 8-9) ==Viewership==