The Returned Extra Becomes a GeniusThe Regressed Extra Becomes a Genius; Hoegwihan Extra-ga Cheonjaega Doem; O Extra Regressado é Um Gênio; 회귀한 엑스트라가 천재가 됨

The story delves into the life of Kim Seon-woo, who got pulled into a famous novel and decided to live a quiet life as a side character. One day, the protagonist of said novel died Do you expect me to believe this? He ends up regressing back in time back to his first day within the novel.