My Secret Terrius Cast , featuring So Ji-sub as a mysterious NIS agent, Jung In-sun as a determined single mother, and a talented ensemble in a blend of suspense, comedy, and espionage.
Table of Contents
Introduction

My Secret Terrius is a captivating South Korean drama that masterfully blends mystery, action, and heartwarming moments. At the core of the series is a stellar cast that brings depth and charisma to each character, making the story both compelling and relatable. Led by So Ji-sub in a powerful comeback role, the ensemble includes rising stars and seasoned actors who together create a dynamic and engaging viewing experience. In this article, we take a closer look at the talented cast behind the beloved K-drama and the roles that made them unforgettable.
My Secret Terrius Cast
So Ji-sub as Kim Bon (a.k.a. Terrius)
Cold, mysterious, and emotionally guarded, Kim Bon ends up reluctantly protecting his neighbor and her children, leading him to rediscover his humanity. So Ji-sub brings a perfect blend of stoicism and warmth to the role, marking his return to television after a three-year hiatus. Known for hit dramas like Master’s Sun and Oh My Venus, So Ji-sub’s performance adds both gravitas and charm to the series.
Jung In-sun as Go Ae-rin
Jung In-sun plays Go Ae-rin, a strong and spirited single mother who is suddenly thrust into a world of espionage after her husband’s suspicious death. Despite her lack of experience in the spy world, her resourcefulness and courage help her navigate danger while caring for her young twins. Jung In-sun, previously seen in dramas like Welcome to Waikiki, delivers a heartfelt and relatable performance that balances vulnerability with resilience.
Son Ho-jun as Jin Young-tae
Son Ho-jun portrays Jin Young-tae, a former conman with connections to a mysterious organization. Initially self-serving and cunning, his character goes through a transformation as he becomes entangled with Kim Bon and Go Ae-rin. Son Ho-jun, known for his roles in Reply 1994 and Go Back Couple, adds both tension and comic relief to the show with his versatile acting.
Supporting Cast
Kim Yeo-jin as Shim Eun-ha
She’s Go Ae-rin’s close friend and one of the neighborhood’s unofficial detectives. Despite being a civilian, Eun-ha is always ready to help with investigations and adds warmth and comic relief. Kim Yeo-jin is a veteran actress known for her diverse roles in dramas like Vincenzo and Extracurricular.
Jung Si-ah as Bong Sun-mi
Jung Si-ah portrays Bong Sun-mi, another member of the Kingcastle moms group. Stylish and slightly dramatic, she brings humor and heart to the show’s domestic side. Her friendship with Ae-rin and Eun-ha offers moments of lightheartedness amidst the thriller elements.
Seo Yi-sook as Kwon Young-shil
Seo Yi-sook plays Kwon Young-shil, a high-ranking official within the NIS. Intelligent, composed, and powerful, she’s one of the key players behind the scenes of the intelligence operations. Seo Yi-sook is well-known for her commanding presence in dramas such as Hotel del Luna and The World of the Married.
Conclusion
The success of My Secret Terrius is anchored not only in its gripping storyline and clever blend of genres but also in its exceptional cast. From So Ji-sub’s brooding performance as the enigmatic Kim Bon to Jung In-sun’s heartfelt portrayal of a mother caught in a web of secrets, every actor brings their character to life with depth and nuance. The supporting cast, with their rich personalities and dynamic interactions, adds layers of humor, suspense, and emotional resonance. Together, this ensemble creates a drama that is as entertaining as it is memorable. Whether you’re a fan of espionage thrillers or heartwarming neighborhood tales, the cast of My Secret Terrius makes it a standout in the world of Korean dramas.
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FAQs
Who plays the main character, Kim Bon, in My Secret Terrius?
Kim Bon, also known as Terrius, is played by So Ji-sub, a veteran actor known for his roles in Master’s Sun, Oh My Venus, and Always. My Secret Terrius marked his return to TV after a three-year break.
Is Jung In-sun really a mother in real life like her character, Go Ae-rin?
No, Jung In-sun is not a mother in real life. She portrays a widowed single mom in the drama but is known for her versatility and emotional range in various roles, including Welcome to Waikiki.
Who plays Jin Young-tae, the ex-conman?
Son Ho-jun plays Jin Young-tae, a slick and cunning former conman. He’s also well known for his roles in Reply 1994 and Go Back Couple.
Is Kang Ki-young’s character based on a real NIS analyst?
No, Kang Ki-young’s character, Kim Sang-ryul, is fictional. However, he represents the more lighthearted, tech-savvy side of the intelligence world and is beloved for his comic relief and support role in missions.
Which cast member has the most experience in spy or action dramas?
So Ji-sub likely has the most experience with action and thriller genres, having played tough, brooding characters in various dramas and films before My Secret Terrius.
Who are the Kingcastle moms in real life?
The Kingcastle moms—played by Kim Yeo-jin (Shim Eun-ha) and Jung Si-ah (Bong Sun-mi)—are seasoned actresses. Their chemistry and comedic timing brought a relatable and entertaining side to the drama.
Are any cast members known for comedy roles?
Yes, Kang Ki-young and Son Ho-jun are especially known for their comedic roles and timing. They bring a great balance of humor to the otherwise tense and dramatic story.
Did So Ji-sub do his own stunts in the series?
While specific stunt details aren’t publicly confirmed, So Ji-sub is known for taking a hands-on approach to action scenes and has a background in action-heavy roles, suggesting he likely performed many stunts himself.