Sotus, Vol. 2 (manga)

Under the SOTUS system, where freshmen undergo hazing from their seniors, Arthit continues his harsh instruction as the head hazer of the Engineering Department. But Kongpob is starting to figure out that it's all just Arthit's awkward way of showing kindness, and he's charmed by it. Meanwhile, the hazers' final task, "The Scramble for the Flag," is soon approaching...