Excuse Me, Please Leave Me Out

I possessed an internet novel popular in the 2000s, featuring the Four Heavenly Kings. As Sung Hae-jun, the twin brother of the sub-male lead (^-^) who sacrifices himself for the female lead. I hadn't even properly experienced college life, and now I'm a student again. Still, I tried to live diligently once more, but this world... is not easy to adapt to. "The only key to moving Seoyeon High's Four Heavenly Kings! The sickly Sung Hae-jun!" The common sense of the world and the words and actions of the people are somewhat overwhelming for a modern person to accept. Hae-jun wants to quickly progress the original story to protect his mental health. Once the female lead appears, attention...