What is the name of this movie? (se inside)?

Korean movie, near future, there is a demonstration on the streets of Seoul and the authorities have a flying robot pouring tear gas on the protesters; At the same time on the docks, a monster is trying to return to the sea while a guy tries to hit him with molotov bombs, he fails, another guy pours gasoline on it, and a girl in sport clothes shots a fire arrow at it setting the creature on fire, now the father of a girl puts off the fire and kills the monster with a spear in orther to retrive the corpse of his daughter from the monsters belly, at the end of the movie he adopts a homeless kid who was friends with his daughter and whom he also pulled out of the monster's guts.