Ordinary Child 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

Yeon-hee, a righteous police officer, struggled with a working mother and raised her son Doyeon alone. Do-yeon, who is 20 years old, grew up to be a 'normal child' with a good heart like her mother's wish. But the dark shadows of serial killings begin to fall on the lives of two happy people. Will Yeon-hee welcome "it" as a mother, who is tightening herself and her son? Will he fight back with the police?