11 must-watch TV shows with Seo Kang Joon if ‘Boyfriend on Demand’ had you swooning

Undercover High School is a 2025 action comedy spy series that places Seo Kang Joon in the central role of Jeong Hae‑seong, a National Intelligence Service agent demoted to undercover duties at a high school while tracking down the missing gold of Emperor Gojong. It aired on MBC from February to March 2025 and spans 12 episodes. The narrative frames Hae‑seong’s dual life within a school setting and his official mission, with supporting cast members including Jin Ki‑joo and Kim Shin‑rok.

In the 2022 series Grid, Seo Kang Joon plays Kim Sae‑ha, an employee of the Grid Bureau, in a thriller mixing science fiction and mystery. The story follows a group tracking down a ghostly figure connected to the survival of humanity after a crisis. Across ten episodes, Sae‑ha, detectives and investigators grapple with a web of secrets tied to the Grid’s origins and a murder that draws all of them into a wider enigma. The series debuted on Disney+ and Hulu, bringing broader international access to his work and standing out among the notable TV shows with Seo Kang Joon in the thriller genre.

When the Weather Is Fine is a romance and drama series based on a 2018 novel. It stars Park Min‑young and Seo Kang Joon, with him in the role of Im Eun‑seop, a quiet bookstore owner who reconnects with a childhood friend returning to their hometown. The show aired on JTBC and unfolds over 16 episodes, emphasising a reflective tone as the characters explore questions of belonging, love and moving on from past disappointments.

In Watcher, Seo Kang Joon appears as Kim Young‑koon in a crime thriller that aired on OCN. The series follows three professionals—a veteran detective, Young‑koon and a lawyer—who form an internal investigation team to probe a violent incident from the past and uncover deeper corruption within law enforcement. Across 16 episodes, the narrative maintains a procedural pace, interweaving personal histories with the broader search for truth.

The Third Charm is a romantic comedy series that charts a long‑term relationship between two very different personalities over several years. Seo Kang Joon stars as On Joon‑young, and the series presents both the beginnings and evolving nature of their connection. Across its broadcast on JTBC, it frames familiar romantic themes within an episodic structure, exploring how individuals grow together and apart. The show emphasises the realistic ups and downs of dating and commitment, with On Joon‑young’s experiences offering insight into personal growth over time. Seo Kang Joon’s portrayal balances charm and introspection, giving depth to a character navigating the complexities of love and self-discovery.

In Are You Human Too?, a KBS2 series, Seo Kang Joon plays dual roles as Nam Shin and Nam Shin III—the human heir to a chaebol family and his android counterpart. The plot centres on the android stepping in for the incapacitated human in the context of family and corporate intrigue, blending science fiction elements with romantic and political beats. The extended run on network television spans numerous episodes, reflecting a complex narrative arc.

Entourage is a Korean adaptation of the hit American series, with Seo Kang Joon as Cha Young‑Bin. The show tracks a group of friends navigating the entertainment industry, careers and personal relationships against a backdrop of film production and media culture. As part of a larger ensemble cast, his role contributes to the series’ take on fame, career ambitions and the practical challenges of show business.

In Cheese in the Trap, Seo Kang Joon appears as Baek In‑ho in the 2016 television adaptation of the popular webtoon. The story focuses on university life and interpersonal dynamics among students, with his character navigating complex relationships and personal history within that context. The series aired on tvN and added to his visibility in longer‑form television outside of genre work. Baek In‑ho’s storyline brings tension and emotional depth, contrasting with the main character’s experiences and highlighting the subtleties of campus life. Seo Kang Joon’s performance was noted for balancing vulnerability and intensity, further establishing him as a versatile young actor.

Splendid Politics is a 2015 historical drama in which Seo Kang Joon plays Hong Joo‑won. Set against a backdrop of court intrigue in the Joseon era, the series explores political manoeuvring and personal stories within a historical frame. It aired on MBC and added period work to his portfolio early in his career. The story focuses on the struggles of princes and courtiers vying for power, with complex alliances and betrayals driving much of the narrative. Seo Kang Joon’s character provides a youthful perspective on the palace dynamics, highlighting his ability to adapt to historical roles.

In Cunning Single Lady, which aired in 2014 on MBC, Seo Kang Joon plays Gook Seung‑hyun. The series focuses on relationship dynamics and personal ambition, following characters as they negotiate the highs and lows of love and careers post‑marriage. Seo Kang Joon’s character adds depth to the story as a younger figure navigating his own aspirations and interactions with the main couple. The show combines humour with realistic depictions of career challenges and romantic complications, highlighting early in his career his ability to support ensemble casts in character-driven narratives.

Each of these projects contributes to the body of TV shows with Seo Kang Joon, offering entry points across genres and years. His engagements range from ensemble television to more central roles, reflecting an ongoing presence in South Korean dramas and series aimed at both domestic and international audiences.

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