What? My Classmate Is Actually the Strongest Mercenary

The world's top mercenary "Blood Wolf" Zhang Lu, in order to complete an ultimate mission, became anonymous and sneaked into the school to become a high school student. During a class trip abroad, a coup occurred in the city where he was located and he was plunged into war. When all the teachers and students fell into despair, he was forced to tear off his disguise and lead his classmates to fight their way through purgatory with his absolute fighting wisdom and crushing strength. In the process, he won the love of the school belle who had previously dismissed him.