Leftovers Day is a Manga/Manhwa/Manhua in english language, ACTION series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Cheon-suk, who was the best chef in the world, was exiled to earth!. In order to return to the heavenly world, he takes up a new job as a high school nutritionist to treat the princess who is attending school on earth.On his first day in office he discovers the ‘Kang Wind’, which has been lost due to a wild boar disturbing the spirit of the mountain, and cheon-suk corporates with the wind to defeat the boar.Afterwards, peace comes to the school for a while,and rumors spread among spirits of the nearby mountain,and more people come to cheon-suk to ask for his help.Cheon-suk fulfills their request and finds a way to cure the princess illness.