Rental Hero

Ju-Won Lee works as a doppelganger who poses as a hero’s alter-ego, and fills in for them in their social life while they perform their duties as heroes. One day, Justice, the strongest hero, approaches Ju-Won and requests his services with the promise of a hefty payment in return for his work. However, when Ju-Won arrives at their meeting spot, he is instead greeted by a completely unexpected sight...

(Source: WEBTOONS, edited)