Unreachable Girl is a Manga/Manhwa/Manhua in (English/Raw) language, Comedy 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

From the same author as Orange Marmalade. Han Tae-Woong is a financially unstable high school student trying to support his single mother. His dream is to become a bodyguard after he graduates. He is destined to cross paths with Kim Gavin, the granddaughter of Korea’s richest chairman. Since she is stuck in a trashy high school, she gets continuously bullied. Thus, Tae-Woong is hired by her grandmother’s company to protect her. The issue lies in her HATING when others invade her privacy. Will Tae-Woong’s attempts to break through her antipathic personality ever succeed?