This play, written and directed by Seong Ki-woong, was selected as a program of the 2011 Seoul Cultural Foundation's Performing Arts Creation Promotion Project.

[1][2][3] In that same year, Kim also took part in another production by The 12th Language, "Scientific Mind - Deep in the Forest," which was performed at Daehakro Information Small Theater from September 30th to October 16th.

Kim Soo-ro played a significant role in expanding Yoon Na-mu's acting career by recognizing his talent early on.

Kim Tae-hoon embraced the name, explaining that it symbolized his aspiration to become a sturdy tree, providing shelter and comfort to others through his acting.

When Kim Soo-ro acquired the Mango Six Apgujeong branch, and Ro Brothers worked as the operators and brand ambassadors for the establishment.

[13] "Black Mary Poppins" was a psychological mystery thriller musical, created as a collaboration between Kim Soo-ro and Seo Yoon-mi.

[14] After completing "Black Mary Poppins," Yoon joined the 4th Kim Soo-ro Project, a play called "Lee Ki-dong Gymnasium."

[15] In 2013, Yoon Na-mu joined the fifth season of the musical 'The Bachelor's Vegetable Store', which was performed at Daehakro Arts Plaza 1 in Seoul from April until July 28, 2013.

Yoon was triple-cast with Jang Hyeon-deok and Jeong Soon-won as Myeong-jun, a character with a cold appearance hiding a false sense of inferiority, in 7th encore performance of the play "Model Students."

Directed by So-young, the musical is an adaptation of the German playwright Frank Wedekind's "Spring Awakening," portraying Korean teenagers.

The story revolves around Young-min, who achieves top grades in school shortly after transferring, and Seon-gyu, an innocent child who loves dancing but is seen as problematic.

[21] The play "Kill Me Now," the 6th work of "Theatre Passion," features Yoon in the role of Joey, a 17-year-old boy with a congenital disability who aspires to become an "adult."

It was his first experience with drama auditions, and because there is a significant difference between stage and camera acting, he practiced with his two juniors before the first shoot, thinking about various scenarios and movements to avoid making mistakes.

[31] In July 2018, in the SBS drama Your Honor, he played the role of the third-generation chaebol Lee Ho-sung, who has no hesitation in resorting to bullying and violence, and perfectly portrayed a cynical character, showcasing his presence as a scene-stealer.

[33] In April 2019, through JTBC's Beautiful World, he delivered a strong message to viewers as the Korean language teacher 'Lee Jin-woo,' who is angry at the school's indifferent attitude towards covering up the death of Park Sun-ho (played by Nam Da-reum).

In his comeback after three years, he showcased a charismatic gaze when looking at emergency patients, and fearlessly gave orders to his juniors, demonstrating a heightened level of professionalism.

He received praise for depicting the growth of the character, as well as portraying the struggles that a real doctor faces and the depth of human emotions.

"Kim Ju-won's Sa-gun-ja: The Seasons of Life" weaves together four beautiful stories inspired by the themes of birth, hardship, love, and death.

Author Ji I-seon created and connected these stories based on the symbolic framework of Sa-gun-ja, completing a script centered around the concept of 'fate' or 'destiny.'

Yoon took ballet and modern dance classes with co-star Park Hae-soo for two months, due to the nature of the play, messages must be conveyed to the audience through gestures as well as dialogue.

Yoon participated in the production, serving as a commentator, a hospital doctor, the parents of the young man, the patient receiving the heart transplant, and becoming Simon and his girlfriend.