I became a Genius Salesman

I became a Genius Salesman is a Manga/Manhwa/Manhua in (English/Raw) language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.com fastest updating comic site. The Summary is

A forever inferior salesman becomes a genius salesman! ​ Medical salesman ‘Ji-hoon’ sells with diligence and sincerity in everything, But he always falls behind ‘Chief Choi’, who monopolizes sales performance through all kinds of lobbying and illegal acts. Even so, Jihoon, who is not swayed by bad temptations and treats other people with sincerity discovers a very special ability,..