Kiss My Ass Boss

It tells the story of Mark, a corporate workaholic who toils away day after day, only to find himself confronted by the Grim Reaper, A Sang, who intends to take him away. However, to everyone's surprise, A Sang is also a workaholic and not only fails to take Mark with him but also mistakenly confuses him with someone else due to his absent-mindedness.
(Source: Chinese = Douban || Translation = ManUtiavN at MDL)
~~ Adapted from the webcomic "I'm Mark" (我是馬克) by Mark (馬克).