《课后战争活动》是一部备受瞩目的电视剧，由成容日执导，申譞洙和李淳元等主演。这部剧以高中生变身军人并开始投身战斗的故事为主线。剧中通过引入未知的宝蓝色球状生命体，为观众展现了一个充满紧张刺激的战争背景。

故事发生在某一天，世界上突然出现了一种未知的宝蓝色球状生命体，给人类带来了巨大的伤害。这些球体分为大小两种，中大型球体具有强大的攻击能力，而小型球体则会主动发动攻击。在危机四伏的形势下，全国的高中生都接受了紧急的军事训练，并被编入军人预备军，开始在全国各地担当起战斗的重任。

军人预备军的任务是保卫城市并摧毁向市中心移动的小型球体。面对这个前所未有的威胁，高中生们迅速适应了军事训练，并化身为勇敢的战士。年幼而稚嫩的他们，面对着生死攸关的战斗，展现出了无比的勇气和决心。

'After School War Event' is a high-profile drama directed by Sung Yong Il, starring Shin Jesu and Lee Soon Won Waiting for the leading role. This drama is based on the story of high school students who turn into soldiers and start to fight. In the play, by introducing an unknown sapphire blue spherical life form, it presents the audience with a tense and exciting war background.

The story happened on a certain day, an unknown sapphire suddenly appeared in the world The chromospheric life form has brought great harm to human beings. These spheres are divided into two types, medium and large spheres have powerful attack capabilities, while small spheres will actively attack. In the crisis-ridden situation, high school students across the country received emergency military training and were incorporated into the military reserve army, and began to take on heavy responsibilities in combat across the country.

The military reserve is tasked with defending the city and destroying small sphere. Faced with this unprecedented threat, high school students quickly adapted to military training and turned into brave fighters. Young and immature, they showed incomparable courage and determination in the face of life-and-death battles.