Associated Names:
Forastero: El hombre invisible
邊緣人的復仇
아웃사이더 : 투명 인간

Summary:
"Han Jungwoo" was a special hire. In his office, he is a complete "outsider," an invisible man. As Jungwoo becomes utterly fed up with being ignored, his body becomes more and more transparent. "Their disregard has reached its limit. From now on, you will be invisible." "People really won't be able to see me? I'll pay back all of your disregard."

https://omegascans.org/series/outsider-the-invisible-man

I recommend reading the manhwa on PC using Yomikiru, and on Android using TachiyomiSY.