Cake by the ocean's feed

I don't remember but some one ask about this
manhwa ,
The demon king who defeated him in his previous life is his current boss?! Baek Young-woong, an ordinary office worker who was reborn with the memory of the hero who defeated the Demon King! The only time the hero's memory helped me was when I was writing a web novel as a child! The hero regrets the useless memories of his previous life in reality. He manages to get a job in the secretary's office of the CEO of Daeryong ENT, a large corporation. However, Hero feels the tension and trembling he has experienced in his previous life to Yeonhwa Do, the CEO he met for the first time... ? It's like facing a very strong beast... !! The tangled romance of a past life demon king, a representative director, a former life hero, and a secretary!

Its name is GOOD LUCK WARRIOR! ..
I hope you find my comment