The Lord's Mercy and Kindness in the Bare Minimum of a Prophet's Message

In chaptert, jonah goes through nineveh, enormously large city. Three days journey, three days to walk through it. Jonah gets barely a day. He says, yet, forty days and nineveh shall be overthrown. And then the people of nineveh believed god. They proclaimd to fast, put on sackcloth,. The king himself takes off his robe and declares, no one's going to eat, noone'sGoing to drink, not even the beasts, not even me. After god calms the storm, they worship god. Yet, JONAH is angry about this whole thing. This is just irony, right? This is always even satire.