These shows all have a girl who has to disguise herself as a boy in them. Plus a couple guys who must disguise themselves as girls

Girls disguised like boys

KBS02

Joseon Dynasty woman Hong Ra On (Kim You Jung) has lived her entire life disguised as a man, earning a living as a relationship counselor and writing romance novels. However, a love letter she wrote for a client leads her to meet the mischievous Crown Prince Lee Yeong (Park Bo Gum), although he’s unaware of her true identity. While their first meeting goes poorly, a bizarre turn of events turns Ra On into a palace eunuch, where she crosses paths with the prince once again. As Ra On navigates the treacherous royal court, an unexpected bond forms between her and Yeong, but their growing affection is complicated by Ra On's secret, the strict social hierarchy, and the political power struggles threatening the throne.

Love in the Moonlight

The Moonlight Lovers

KBS2

During the Joseon Dynasty, Kim Yoon Hee (Park Min Young) disguises herself as a boy to support her struggling family by taking entrance exams for other students at Sungkyunkwan University. When the principled Lee Sun Joon (Park Yoo Chun) discovers her scheme, he unexpectedly helps her take the exam under her brother's identity and enter the university herself. They become roommates and classmates, with Yoon Hee befriending the playboy Goo Yong Ha (Song Joong Ki) and rebellious Moon Jae Shin (Yoo Ah In), while simultaneously developing feelings for Sun Joon. As she struggles to maintain her secret identity, Yoon Hee must navigate the challenges of university life and her growing emotions. This is a 2010 South Korean historical drama series based on a bestselling novel and directed by Kim Won Suk and Hwang In Hyuk.

Sungkyunkwan Scandal

Aspiring nun Go Mi Nyeo (Park Shin Hye) never expected to receive this mission: stand in as her twin brother Mi Nam in the idol band A.N.Jell while he tries to get a botched plastic surgery revised. Suddenly thrust into the glamorous and cutthroat world of K-pop, Mi Nyeo must navigate the challenges of living as a man while keeping her true identity a secret from the band's demanding leader, Hwang Tae Kyung (Jang Geun Suk), the kind-hearted Kang Shin Woo (Jung Yong Hwa), and the cheerful Jeremy (Lee Hong Ki). As she struggles to maintain her disguise amidst hilarious mishaps and close calls, Mi Nyeo finds herself entangled in a complicated web of friendship, rivalry, and unexpected romance, all while trying to achieve her brother's dream.

You're Beautiful

The A.N.JELL Team

In this gender-bending musical drama, Gao Mei Nu (Cheng Yu Xi) is thrust into an unexpected role when her brother needs her help. After Gao Mei Nan (also Cheng Yu Xi) is unable to join the popular boy band A.N.JELL due to a medical emergency, Mei Nu – who is training to become a nun – must disguise herself as a male idol. She must navigate the challenges of maintaining her secret from the band's lead vocalist Huang Tai Jing (Jiro Wang), guitarist Jiang Xin Yu (Hwang In Deok), and rapper Jeremy (Evan Yo). As she struggles to keep her true identity hidden, Mei Nu must prove herself as a performer while avoiding discovery. This is a 2013 Taiwanese drama series, a remake of the popular 2009 Korean drama "You're Beautiful."

Fabulous Boys

FABULOUS 

Tencent

Jiang Yi Cheng (Xing Zhao Lin), a brilliant programmer previously betrayed by a woman, refuses to hire women at his company. Lu Li (Zhu Xu Dan), an admirer of Yi Cheng’s work, disguises herself as a man to get hired. Maintaining her disguise proves challenging, and when Yi Cheng discovers her identity, Lu Li brokers a deal that opens the door for romance. Directed by Wu Qiang, this is a 2021 Chinese romantic comedy series.

Cute Programmer

⌨️ Ctrl + Love 😍

Fuji TV

Mizuki Ashiya (Horikita Maki), a female high school student, transfers to an all-boys' boarding school in Osaka to be near her idol, high jump athlete Izumi Sano (Oguri Shun). Disguising herself as a male, she successfully enters the school and becomes Sano's roommate. As her secret begins to unravel, Sano develops feelings for her, and other classmates become attracted to her as well. When her brother arrives to take her back to the USA, the situation threatens to spiral into chaos. Based on the 2004-2008 manga series by Hisaya Nakajo, "Hana-Kimi" is a 2007 Japanese drama series directed by Matsuda Hidetomo, Tsuzuki Junichi, and Sato Genta.

HANA-KIMI

Team of Successful.

iQiyi

As Chinese military forces fight back against the invading Imperial Japanese army, the government conscripts young men to defend the country. Xie Xiang (Bai Lu) urgently wants to join the battle, fueled by her hatred of injustice. There’s just one problem… she’s a woman! Refusing to let that stop her, she cuts her hair short and assumes her brother’s identity, eventually getting drafted into an elite military academy in Shanghai and befriending other recruits, including the quarrelsome rich kid Gu Yan Zheng (Xu Kai) and the more introverted Shen Jun San (Li Cheng Bin). Xie Xiang wants to keep her true identity a secret, but when both Yan Zheng and Jun San start to fall for her, the challenge becomes increasingly difficult. Will the comrades-in-arms survive the bitter ravages of love and war? This 2019 Chinese period drama was directed by Hue Kai Dong.

Arsenal Military Academy

The All Guns Blazing Team

After being attacked by a group of female assassins, young swordsman Jeon Nok Du (Jang Dong Yoon) sets out to track down one of his assailants. However, his quest leads him to a village populated entirely by widows. In order to evade detection, Nok Du disguises himself as a woman while he searches for clues. But one of the residents, Dong Dong Ju (Kim So Hyun), learns Nok Du’s secret identity… although she has a secret of her own: she has escaped from an ill-fated gisaeng (courtesan) apprenticeship. Will they succeed in keeping each others’ identities a secret? And what will happen when they begin to fall for each other? This 2019 South Korean drama series was based on the hit webtoon “Nok Du Jeon” by Hye Jin Yang and was directed by Kim Dong Hwi.

The Tale of Nokdu

💞Lovers Secrets Joseon's Team

Xue Wen Xi (Ju Jing Yi), daughter of an impoverished family, disguises herself as a boy to work as a writer and support her loved ones. When the Prime Minister's son, Feng Cheng Jun (Song Wei Long), discovers her talent, he arranges for her to enroll in the male-only Yun Shang Academy. Adopting her brother's name, Wen Bin, she lives in constant fear of her secret being exposed. Despite her challenges, Wen Xi excels academically and forms close bonds with three fellow scholars, becoming part of the "Yun Shang Quartet". As she navigates her new life, she develops romantic feelings and finds inner strength. However, the threat of her true identity being revealed looms large. This is a heartwarming 2020 historical romance drama directed by Zhi Lei, exploring themes of love, family, and friendship.

In A Class of Her Own

📜 Fantastic Scholars 📜

SETTV

Pi Ya Nuo (Megan Lai) was born a girl but destined to live as a boy for 25 years due to a fortuneteller's prediction that she would not survive childhood otherwise. Shy and aloof, she keeps her true identity hidden, which ironically makes her attractive to those around her. When she accidentally helps triad leader Du Zi Feng (Baron Chen) and his sister Du Zi Han (Mandy Tao), her life takes an unexpected turn. Zi Han falls in love with Ya Nuo, while Zi Feng becomes her "sworn brother" and closest friend. As her 26th birthday approaches, Ya Nuo faces uncertainty about her long-awaited return to her true gender and the challenges that come with it. This is a 2015 Taiwanese drama series directed by Chen Rong Hui.