[[quoteright:265:https://static.tvtropes.org/pmwiki/pub/images/265px-18dtk_1873.jpg]]
[[caption-width-right:265:Left to right: Shi Yanfeng, Pei Pei, and Gu Yuetao.]]
->''"In this world, there are only two things that are indiscriminately fair. The first of which is that each day has only twenty-four hours. The second, that every person will die some day. Each of you will be facing the college exams at the end of this year, and during this year, I hope each and every one of you will give thought to what kind of person you will be after you leave this school, and become an adult. To each of you, I ask: What is it that you hope to accomplish with your life?"''
-->-- '''Principal Xiong'''

''18-Year-Old Sky'' (十八岁的天空) is a Chinese high school drama inspired by ''Manga/GreatTeacherOnizuka'' that aired 2003-2004, spanning 22 episodes.

One of the most well-known high school dramas in mainland China, it stars Bao Jianfeng as the quirky and unconventional Gu Yuetao, a newly hired high school teacher, who is determined to bring out the best from each and every one of his students. He meets challenges in the form of his tomboyish and MoodSwinger coworker Pei Pei (Ni Jingyang), the somewhat antagonistic student Shi Yanfeng (Li Zhinan), and constant complaints from parents concerning his untraditional teaching methods. Although his students vary greatly in terms of academics and personality, Yuetao helps them in not only an educational sense, but also by establishing a personal connection, helping them see past the horizons of their eighteen-year-old sky.

A sequel, "Eighteen-Year-Old Sky 2", aired from 2012-2013.

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!! This show provides examples of:
* AlphaBastard: Yanfeng, to some extent.
* BadassTeacher: Pretty much required of this genre.
* CatchPhrase: "[insert student name here] is a very unique student..."
* CharacterDevelopment: The point of the entire series is for Yuetao to gradually develop each of his students.
* DefrostingIceQueen: Wu Dandan can be seen as such following the events of episode 8. In addition, Pei Pei eventually warms up to Yuetao's antics.
* {{Determinator}}: Yuetao, and a lot of the teachers as well, when it comes to helping a student.
* GratuitousEnglish: Though this is a given for Chinese dramas in modern settings.
** Shi Yanfeng's cohorts nickname him "Star".
** This is used as an interjection between students a lot in China.
* HiddenDepths: A lot of the teachers and students have these; in fact, almost one is revealed every episode.
* JerkWithAHeartOfGold: Yanfeng turns out to be this.
* KickTheDog: Wu Dandan does this to the poor guy who asks her out to the most expensive restaurant in the city.
* LargeHam: Teacher Gu Yuetao.
* ManipulativeBastard: Shi Yanfeng's many plots to get Teacher Gu fired.
* NerdGlasses: A few of the students.
* NewTransferStudent: Wu Dandan.
* OrdinaryHighSchoolStudent: At least, until they become the [[WoobieOfTheWeek Student of the Week]].
* PapaWolf: Do NOT mess with Gu Yuetao's students.
* PresentDayPast: This show was filmed in 2003, and technology that runs rampant in the current day (such as smartphones and readily-accessible computers) are noticeably not present.
* ScrewTheRulesIHaveConnections: Shi Yanfeng's defiance to Yuetao can be summed up as such.
* SillyRabbitIdealismIsForKids: One of the reasons why certain characters resist change.
* {{Tsundere}}: Pei Pei, Type A, but only to Yuetao.

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