I Played the Substitute Too Well

あらすじ

Karina, an ordinary extra in the novel "Something About That Guide," finds herself in a pivotal role. To alleviate the awakening pains of the male lead, Hedonia, she must provide her blood as a Guide of the same rank. Despite her powerful abilities, Karina is destined to become a villainess, corrupted by the wealth and honor gained from her service. Her plan is to fulfill her temporary role within the Duchy, observe the main characters' romances, and then quietly exit the story, having sought nothing from being a substitute.