Reborn behemoth, summoned by his girlfriend

Lin He was reborn three years ago and became an iron-eating beast in the spirit beast world, where he happened to be contracted by his girlfriend, who had the talent of a summoner.
To protect his girlfriend and prevent her from repeating the same mistakes, he became a stumbling block on her path of violence.
"Humble summoner, your talent is too poor. You should give up martial arts."
"Why are you fighting? I'm sleepy, I want to go to sleep."
"You didn't expect that, did you? I'm coming clean. I'm a useless spirit beast."
……
My name is Zhang Xiaohui, and I was originally a third-year student majoring in summoning. On the battlefield, we were attacked, my boyfriend sacrificed himself to save me, and then I was reborn.
In this life, I will cultivate diligently to prevent the tragedy from repeating itself. Fortunately, I have formed a contract with an iron-eating beast. But why is it different from other spirit beasts?

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