I, The Grandson of Garp, Scared Luffy Into Tears

Once through the pirates, Lu En became the son of Monkey d Dragon, a grandfather named Monkey d Karp, and an unreliable and neurotic younger brother named Luffy. Fortunately, the ghost back system is activated! The completion of the ghost back is 10%, and the training effect is increased by 100 times! The completion of the ghost back is 20%, and the training effect is increased by 1000 times! … One day, Lu En, a ghost-backed master, appeared in front of Luffy who was shouting to go to sea, and made Luffy cry on the spot. Luffy: “The pirates in the sea are all monsters like my brother? I don’t want to go out to sea!” Garp: “For a long time, the two boys, Long and Luffy, with small arms and calves, I really doubt that they are not my sons and grandsons. Like Lu En, they are the grandsons of the old man!” Warring States: “The strongest creature in the sea, land and air is Kaido? No, it’s Lu En!” - Description from novelcodex.org