He could have done it more cruelly, but he still chose the nicest way to get revenge.

He's handing out retirement to his grandmother who tried to kill him. Also, Dojun's the boss most employees wish they had. Most bosses would try to lessen/avoid their employees retirement pay, But dojun plans the opposite...

Which remind me, the late-principal of the school I went too was retiring and did retire, the school promised to pay him his retirement fee after working for 20+ years for them and yet the school kept delaying it, the late principal had to go back work, he even received donation from his former students who heard about his illness, even though he was extremely sick, he taught part time because the retirement fee was still not paid even after a year... The school still delayed it, delayed it, until he passed away.