Agin-deur-ui Daesahyeong

In Murim, four of the most feared criminals were known as the "Bloodstorm Lions"—ruthless, merciless, and utterly irredeemable. But one day, they were given something unbelievable: a senior disciple. And not just any master... Their new "Grand Senior Brother" is an 8-year-old boy: Geom Woo-bin. Armed with an undeniable charm, handsome looks, and unshakable confidence, Woo-bin isn't here to reform these villains... He's here to rule Murim in his own way! Follow the chaotic and hilarious journey of this unlikely brotherhood, as the villains who once terrified the world now find themselves under the rule of an 8-year-old prodigy!

(Source: KakaoPage, translated)