Kim Min Chul

Sungjin High School is thrust into chaos as an alien invasion begins, unleashing violent insect-like creatures worldwide. With the South Korean military overwhelmed, mandatory conscription is imposed on all third-year high schoolers, forcing them to undergo military training while facing impending university exams. Platoon leader Lee Chun Ho guides them through rifle shooting, combat, and obstacle courses, all in their school uniforms. Class teacher Park Eun Young strives to protect her students. Can these high schoolers become saviors in the face of global doom? (Source: MyDramaList) ~~ Adapted from the webtoon "Duty After School" (방과 후 전쟁활동) by Ha Il Kwon (하일권).

Jooshin High School, the most prestigious in South Korea, was established by the Jooshin Group and admits only students selected at birth. Among them are Jeong Jae Yi, daughter of the Jaeyool Group's head; Kim Ri An, successor of Jooshin Group; Yoon He Ra, youngest daughter of International Yoon; and Lee Woo Jin, second son of a political family. Kang Ha, a transfer student with a secret, joins Jooshin High. His innocent smile masks a hidden truth that starts to disrupt the school's rigid world. (Source: MyDramaList)

An asteroid is on course to crash into Earth in 200 days and destroy the planet. The world soon learns of the news and falls into chaos. Jin Se Kyung works as a middle-school teacher in Woongchun City. She learns about the impending end of the world. She decides to quit her job and do volunteer work at a child and youth division in city hall. She struggles to save children in danger. Her boyfriend of many years is Ha Yoon Sang. He currently works as a researcher at a biotechnology research institute in the United States. After news of the end of the world is released, he flies back to South Korea to be with Jin Se Kyung. Woo Sung Jae is an assistant priest at a Catholic Church. The presiding priest at the church ran away after news broke out about the approaching asteroid. Woo Sung Jae now takes care of the parishioners at the church. Kang In A is a commander of a combat support battalion. She goes around Woongchun City, which has been ruined, to provide supplies, transport and security. (Source: AsianWiki) ~~ Adapted from the novel "Shumatsu no Furu" (終末のフール / ) by Kotaro Isaka (伊坂 幸太郎).