Yoon Jong-bin as Jo Jang-soo, the vice-president of Class 3–2.Woo Min-gyu as Kim Duk-joong, a military virtuoso of Class 3–2 and someone who likes to eat.She is selfish and stubborn and becomes a tension factor in the war. Oh Se-eun as Hong Jun-hee, the 'professional complainer' student of Class 3–2.She tries to make rational decisions even in confusing situations. Yeo Joo-ha as Kim Yu-jeong, the class president of Class 3–2.Ahn Do-gyu as Kook Yeong-su, a student of Class 3–2 who creates a conflict with his classmates with his selfish appearance of worrying about his safety even at a time of crisis as a 'shop-obsessed man' who thinks that every minute and every second other than studying is a luxury.Ahn Da-eun as Kim In-hye, a student of Class 3–2.She shows an unexpected wit in the midst of war with her kind and altruistic personality who silently takes care of her friends. Shin Hye-ji as Choi Yeon-ju, a student of Class 3-2.She has a crush on Chun-ho, the platoon commander. Shin Soo-hyun as Cha So-yeon, a student of Class 3–2.Shin Myung-sung as Im Woo-taek, a student in Class 3–2.Moon Sang-min as Wang Tae-man, the mood maker student of Class 3–2.Kim Jung-lan as Park So-yoon, a student of Class 3–2.

Kim Su-gyeom as Kwon Il-ha, a troublemaker student of Class 3–2 who does whatever he wants.

She is a timid and soft-hearted personality.

Kim So-hee as Lee Soon-yi, a student of Class 3–2.

He is best friends with Woo-taek and has a crush also on Na-ra. Kim Min-chul as Do Soo-cheol, a student of Class 3–2.Although seemingly timid, he takes the lead at times in rescuing his friends. He is introverted and has no special dreams or desired colleges. Kim Ki-hae as Kim Chi-yeol, a student of Class 3–2.Though she helps others, she frequently bullies Ae-seol. Kwon Eun-bin as Yeon Bo-ra, a student of Class 3–2 with a frank and hot-tempered personality.Im Se-mi as Park Eun-young, the homeroom teacher of Class 3–2 who prioritizes the students' safety.Though he is 21 years old, he looks much older so he is teased by the students for his looks. Lee Soon-won as Kim Won-bin, a sergeant who is a faithful assistant to Chun-ho.He is initially firm with the students but warms up to them and cares for the them more than anyone else. Shin Hyun-soo as Lee Chun-ho, a lieutenant and platoon commander of Class 3–2.Horizontal poster (webtoon version) of the series.

Love is war 16