ka24de rod bearing problem. need advice

[puerkone]

So I looked on the 240sx fsm and could not find an answer to how to fix this problem. I bought an engine from a guy and looks like he did not told me that his engine was knocking. I dissasseambled the engine and found 1 destroyed rod bearing. Now to fix it, do I just buy a new set of rod bearings and it will be good to drive? or should I also replace the entire crankshaft. let me know what you think, thanks.

By the way on the left, the journal feels smooth compared to the journal on the right that has a good rod bearing.