The Nightmare Spirit Boy 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

Nightmare demons are born from the dark side of the world. Fourteen years ago, a nightmare demon named Ya caused irreparable damage to the Snow Spirit City, leading to the deaths of countless tribesmen. Fourteen years later, a boy named Bai Ya encounters an invasion by a mysterious nightmare demon. After experiencing numerous crises and battles, Bai Ya continues to grow and embarks on an adventurous journey full of danger and excitement, exploring unknown worlds.