Childhood Friend Complex is a Manga/Manhwa/Manhua in english 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

Ha-neul and Mincheol have been childhood friends for all of their lives, but their relationship takes on a whole new dynamic when they undergo a series of unexpected events. Although they vowed that they'd never be romantically attracted to each other, they just might be proven wrong... especially when things start to escalate and neither can predict where they'll end up.