Usually the South Korean left is blamed for the public's lack of patriotism, but it is the right who made blood nationalism a state religion.
Nationalism is about putting the (ethno-)nation above liberal-democratic and leftist values alike. Once one takes that step, one is not separated from other nationalists by anything irreducible. South Korea’s Nationalist-Left Front (2019)
South Koreans do not consider the integrity of their state important enough to go to war for. Interview with Chad O'Carroll (2012)