So MC disappeared for a year. He was transgmigrated to a world mostly covered with oceans by a hunting/cooking system. He transmigrated there because his blood comes from one of races that lived there in the past, now noone except wild life lives there. MC is a Siren. In order to leave that planet MC needs to earn points by hunting fish and stuff there. So MC returns, he first sell fish he caught in the other world, later on he opens a sea food restaurant. MC's food have effects like improving health, healing illnesses thanks to fish from other world. He basically travels between worlds to get supplies for his restaurant. ML is a sick guy who won't live past his 30? because of a disease. At the start of the story he can't eat anything duo to his disease, one day MC's friend brings him a fish he bought from MC which ML can eat and improve his condition a little so ML first buys fish from MC through his friend and later frequents MCs restaurant. MC's restaurant has a set of rules; no takeout, menu is what mc wants to cook that day etc. And only ML gets preferable treatment from MC. There are several more plots about a supernatural team from goverment coming to MC cause his food improve their abilities, an entertaintment company MC worked in the past, two sides of MCs family( he thought he was an orphan before) his father's side wants to take advantage of him, his mother side is where he gets his Siren genes from etc. Later on the story Earth's oceans also began to mutate with giant sea monsters appearing etc. I can write a lot more but I'm busy right now. Hope this much information is enough.