
Seo Kang Joon is finally back on screen after completing his mandatory military service as an active-duty soldier, and fans couldn’t be more thrilled!
His last drama, Grid, was a gripping 10-episode mystery thriller, but many still remember him best for When the Weather is Fine, a heartfelt romance.
Now, he’s making a powerful return in Undercover High School, taking on the role of a top NIS agent disguised as a student.
While we enjoy his latest action-packed drama, let’s take a look at some of his best works that you should add to your watchlist!
Grid (2022)

The Earth is protected by the Grid, a planetary defense shield that saved humanity from deadly solar winds. Kim Sae Ha, an employee at the Bureau, crosses paths with a murderer, leading Detective Jung Sae Byeok to take on the case.
However, during the chase, she witnesses something unbelievable — the founder of the Grid, a mysterious figure from the past, has returned after 24 years. Even more shocking, she seems to be helping the fugitive.
This thriller unravels the hidden truth behind humanity’s survival and the secrets of the Grid.
When the Weather Is Fine (2020)

Exhausted from life in Seoul, cellist Hae Won returns to her hometown, Bookhyun Village, to escape painful memories.
There, she reconnects with Eun Seob, the owner of Goodnight Bookstore, whose quiet life revolves around books, coffee, and blogging. As they spend time together, their lives begin to change in unexpected ways.
Watcher (2019)

An inspector, once betrayed by a trusted senior, dedicates his life to exposing corruption. A young police officer struggles with the suspicion that his father may have killed his mother.
A lawyer, once threatened with death, is pulled back into danger. When these three individuals reunite to investigate the kidnapping of a group president’s son, they form an internal police task force, uncovering the dark realities of power in this intense psychological thriller.
The Third Charm (2018)

Spanning 12 years, this romance follows two people with opposite personalities who keep finding their way back to each other.
At 20, On Joon Yeong is a nerdy university student who sticks to routines, overthinks everything, and dresses plainly. With encouragement from friends, he joins a blind date and meets Lee Yeong Jae.
Yeong Jae, who never attended college, works as a hairdresser’s assistant and dreams of success. Unlike Joon Yeong, she is bold and outspoken. Despite their differences, they fall in love. Over the years, they reunite at 27 and again at 32. But will they get their third chance at love?
Are You Human Too? (2018)

When Nam Sin, heir to a powerful family, falls into a coma, his mother, a genius in AI technology, activates a secret project. She had built Nam Sin III, an android identical to her son, and now he must take his place.
As he navigates the dangerous world of power and deception, can an AI truly replace a human?
Cheese in the Trap (2016)

Hong Seol, a hardworking student, returns to college after a year-long break only to find herself at odds with her seemingly perfect senior, Yoo Jung. Though charming and intelligent, Yoo Jung has a hidden dark side.
As her life takes a turn for the worse, she suspects he’s behind it. But suddenly, he starts acting friendly toward her.
Is he sincere, or is there something more sinister behind his actions?
Splendid Politics (2015)

Born into the royal family, Princess Jung Myung was once celebrated as a child. However, after her father’s death, her world crumbled. King Gwang Hae, fearing threats to his throne, ordered her execution.
To save her, her mother sent her into hiding, but assassins pursued her. Witnessing the deaths of her protectors, Jung Myung was eventually sold as a slave in Japan. Determined to survive, she erased her past and worked in a sulfur mine, where she secretly gathered information.
When an opportunity arose, she returned to Joseon, vowing to reclaim her rightful place and take down the man who had stolen everything from her.
The Best Future (2014)

Choi Go dreams of becoming an idol but struggles to make ends meet with part-time jobs. Mi Rae, a new employee in the talent development field, is also trying to establish her career.
By chance, they end up as housemates. With completely opposite schedules—one working by day and the other by night — they communicate only through notes on a message board.
After School: Lucky or Not (2013)

Kim So Eun is a shy and reserved high school student until she receives an invitation to the "Lucky or Not Club".
There, she meets five handsome boys who declare her their leader. Every day, they draw a random mission, pushing So Eun out of her comfort zone and into a series of wild, unforgettable adventures
What an Exciting Comeback !
Seo Kang Joon’s post-military comeback is already proving to be a massive success, and Undercover High School is just the beginning.
Whether you love his intense performances in thrillers or his heart-fluttering moments in romance dramas, his filmography has something for everyone.
Which of his past dramas is your favorite? And how are you liking his return to K-dramas? Share your thoughts in the comments!
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