When I Put up the Strongest Barrier in the Country, It Became Too Peaceful and I Was Banished. They Did Know That That Barrier Isn't Permanent, Right? 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

A young man, Shield, can only use the beginner magic [Barrier] and has been looked down upon. Despite putting up an ironclad barrier to protect the country, he is deported due to his fiancée's tricks. However, before he knew it, he had subjugated the strongest dragon (a young girl), was courted by beautiful women from other countries, and was being followed by a group of brutal demons!? A new type of battle action begins, woven by Shield, a young man who can only protect himself, but whose defense is the strongest!