Available as both manhwa and novel.
The Extra Wants to Escape From the Obsessive Male Lead Figurante en fuite
Also known as: 집착남주 두고 튀려는 엑스트라입니다, An Extra Who Wants To Escape The Obsessive Male Lead · The Runaway Extra and the Obsessive Duke · An Extra Who Wants to Escape the Obsessive Male Lead · Die Nebenfigur will fliehen! · Figurante en fuite · I'm an Extra Who's Trying to Run Away from the Obsessive Male Lead · I'm Just an Extra, but I Want to Run Far Away From This Obsessive Male Lead · Второстепенный персонаж, который хочет сбежать от одержимого главного героя · 執着系ヒーローから逃げたいモブ令嬢です · 집착남주 두고 튀려는 엑스트라입니다 · Jipchangnamju Dugo Twiryeoneun Extra Imnida
In this world, a duke's full power can only be unlocked by uniting with his "phero," his destined mate. So, to undermine his rival, Krua's father sends her to Duke Arzenta disguised as his phero, hoping she'll take his innocence and his power with it. But Krua has no intention of playing along! If she can just convince her fiancé to join hands with her and keep up the enamored newlyweds act until his real phero appears, she'll be able to flee safely when the time comes... But will he let her go?
