I'm Just Upholding Justice for Heaven!

The young leader of the demonic sect, whose reputation has been soaring lately, keeps insisting on going out into the martial world to "uphold justice on Heaven's behalf," giving his older brother, the sect's chief leader, a splitting headache. In the chief leader's eyes, his talented, handsome, and virtuous younger brother has one fatal flaw: he's extremely chuuni, does stupid things every day, and is especially adorable. So the chief leader is always worried that his clueless darling will be deceived by some shady woman with ulterior motives. The chief leader confidently entrusted his darling younger brother to his most trusted deputy, ostensibly to keep him safe, but secretly to have the deputy keep a close eye on his social life. But he never imagined those two would come back holding hands. The young leader glanced at his brother's livid face and whispered to his lover: "He's definitely thinking about how to break us up with those hands stained by blood. What a foolish older brother." The gong nodded as if he were taking this seriously, then whispered back: "Then the only way to keep our relationship going is to depose the chief leader." The young leader declared righteously: "We're upholding justice on Heaven's behalf!" The chief leader: "?! You're whispering that loudly. Do you think I'm deaf?!" A gentle, chuuni little prince shou x a mature, reliable, steady gong who joins him in being chuuni