What Happens When the Second Male Lead Goes on Strike

I was transported into the romantic fantasy novel my younger sister was reading, not as the male lead but as the second male lead. If I remember correctly, this punk is fated to go into war in the future and die in the male lead’s place. Okay, I’ve made up my mind. Let’s not go anywhere near the main characters and stay healthy until I can go home.
서브 남주가 파업하면 생기는 일 / What Happens When the Sub Male Lead Goes on Strike / When the Third Wheel Strikes Back / 섭남파업