The Disciple I Trained Became the Antidote to My Ex-Wife

The Protagonist Has Strong Martial Arts Skills but Is Relatively Low-Key, Martial Arts Type

The protagonist is very powerful in martial arts and everyone in the world has heard of it. However, due to some changes, he hides his identity and strength. However, he often has to take action for various reasons. After arousing suspicion, he comes back with his words.