Reincarnated into a Game As the Hero's Friend

Tbh the story title should just change to "Reincarnated as the Hero's doormat : I'll gladly become the loser for the Hero"

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I feel so utterly pissed with MC. Despite having mediocre combat talents, he actually quite OP in other area. AND HE DID NOT USE THAT ABILITY WELL ENOUGH. He's smart and tactful, his strategy actually very useful in wars, and his knowledge from modern world actually helps solves the kingdom problems. MC actually contributes waayyy a lot more than hero and his party. But what? He graciously step back, not wanting to steal the hero spotlight and content being a doormat. He's okay having his reputation stained just for helping the hero. He's okay that his invention claimed by the kingdom and just get paid with some cash. He's okay being sent to the borderlands where the demon general is lurking, he's okay even knowing the kingdom sent him there expecting him not to win at all and utterly crushed by the demon. I MEAN HELL, BE MORE SELFISH PLS! I get that MC is willing to aid the hero to kill demon king but reducing yourself by being a pushover is not the way. Grow you power and influence, make that so the kingdom cannot hold your family and the hero family hostage, so they listen to your voice, so they give what you deserves, so you can move more freely and give the support the hero need. Isn't that the way?

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I'm sick seeing MC achievement being doubled down like it was nothing. Even when he fends off the demon general, all the glory goes to the hero and he just get scraps. MC is just the kingdom lapdog who's happily do anything. What a stupid MC.