Devoured by darkness, the lonely boat in the rust sea sheds its shell in seven days! The orphan Su Jin accidentally inherited the ancient evil mark "Swallowing the Sea", which can swallow all things, but at the cost of flesh and blood distortion and loss of humanity. The cold beast "Xu" wakes up in his body and announces the countdown to death: If he does not complete the "shedding" and evolve into the "Ship Eater" within seven days, he will become a monster and bite back the steel snail boat "Iron Stomach" that carries the last human! Surrounded by the endless sea of filth and giant beasts, he must devour powerful enemies, control the vicious marks, and complete the ultimate transformation before being completely deformed - in human form? Is it a monster? Or the boat eater who drives a lonely boat?
