My Retirement Was Ruined by a Penguin

This setting cleverly combines killers, animal comedy and daily life. The former world's top killer Jin Pen quit his job and opened a dumpling restaurant. He wanted to be a quiet handsome man, but he was completely disturbed by a penguin he rescued that could speak ventriloquism - because this penguin always used his voice to tell him various ideas about "disposal of corpses" when he received guests.