No Gain No Love is a romantic drama about four adults whose lives become tangled through fake marriage, career struggles, and unexpected emotional romance. The center of the story is Son Hae-yeong, who simply can't handle losing at anything. One day, when she realizes she might be able to get a promotion at work if she seemed more settled, she fakes a wedding to look more stable and dependable.
She recruits Kim Ji-wook for her plan. Ji-wook is a convenience store cashier who can't say no to helping. He becomes her fake fiancé, and this is when comedy starts, and some real feelings crawl back into her life.
What makes the show's journey more worthwhile is the cast members' performances while playing such complex characters. Here is the complete cast and character guide to the heartwarming show, No Gain No Love.
No Gain No Love cast and character guide: Who plays whom explored

Alongside the main couple, the show also looks at another couple in parallel, including Bok Gyun-hyeon, a polished chaebol CEO who believes that love is nothing but a biochemical reaction. His belief breaks when the protagonist's foster sister, Nam Ja-Yeon, shakes up his world. The show has given birth to some interesting characters, and when their lives intertwine, it becomes a rollercoaster journey.
Here is the complete list of all the primary characters in No Gain No Love.
Shin Min-a as Son Hae-yeong
Son Hae-yeong has a problem with losing at anything, be it fame, money, opportunity, or affection. She is someone who continuously calculates emotional and financial loss, especially after her childhood problems. When she grows up, this mindset becomes extreme. She realized that she might get a promotion at work; she faked her wedding to appear more stable and reliable in general.
Though she seems to be purely driven by logic, Hae-yeong is sensitive. She is lonely and deeply afraid of being left behind. Wondering where you have seen the actress before? Hometown Cha-Cha-Cha and Tomorrow with You are some notable works by Shin Min-a.
Kim Young-dae as Kim Ji-wook

Kim Ji-wook works part-time at a convenience store. He’s portrayed as very kind-hearted, having never learned to say no to anyone who needs his help. He gets involved in Hae-yeong's idea of a fake marriage. Ji-wook seems hesitant at first but is unable to say no to her and agrees. His calm energy and presence perfectly counter Hae-young's chaotic and loss-averse life.
Kim Young-dae plays the role and has also appeared in Shooting Stars, among others.
Lee Sang-yi as Bok Gyu-hyeon

Bok Gyu-hyeon is a third-generation chaebol and the polished CEO of a biotech company. He is portrayed to be logical and ambitious, given his position. He doesn't believe in fate or romanticize love. But to him, love is just a "reaction" to something. When he meets Nam Ja-yeon, his worldview is challenged. His storyline provides a contrast to the fake-marriage chaos going on in parallel.
Hometown Cha-Cha-Cha and Youth of May are among the actor's notable works.
Han Ji-hyun as Nam Ja-yeon / Yeon Bo-ra

Nam Ja-yeon is a famous web novelist who writes bold, R-rated content under the pseudonym Yeon Bo-ra. She is portrayed to be confident and imaginative and loves Son Hae-yeong. The two flatmates live their two different romantic lives, creating the dynamics of opposites. Hae-yeong is strict and economical, while Ja-yeon is creative and emotional.
Her connection with Bok Gyu-hyeon brings emotional complexity, as she challenges his beliefs while confronting her own insecurities as a creator and as a woman in a vulnerable industry.
Han Ji-hyun plays the role and has previously shared credits in Cheer Up.
In addition to this, the supporting cast in No Gain No Love includes Jeon Hye-won as Kwon Yi-rin, someone in Hae-yeong's social circle. Lee You-jin appears as Yeo Ha-jun, Gyu-hyeon’s secretary, and Joo Min-kyung as Cha Hui-seung, Hae-yeong’s longtime friend, a voice actress. Alongside them is Go Wook as Ahn Woo-jae, Hae-yeong’s ex-boyfriend and her mother's role is played by Yoon Bok-in.
Stream No Gain No Love only on Amazon Prime.