hanlim gym is a Manga/Manhwa/Manhua in (English/Raw) 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

'I want to be the strongest man in the world.'
Jeon Young-ha, who practiced wrong strength, enters Hallym Gymnasium, realizes his true strength, and becomes a martial artist.