I'm just throwing this hypothetical out there for context: the Superman I'm talking about is from CW's Superman & Lois. What if Jonathan Kent (age 23) was secretly a superhero with powers different from his father? He got powers before knowing his dad was Superman in a reckless, dangerous accident.

Two years later (Jon is 23) Clark finds out about Jon's superhero activities by looking through his journal. And sees that Jon is an expert liar, gaslighter and manipulator. Jon says he uses Clark and Lois's focus on Jordan and exploits that weakness to be a superhero. He figures if the attention is on Jordan, he can be a superhero in private.He says his mother isn't "smart enough" to figure out Jon's identity, and Jordan is an "idiot", so the hardest person to hide from is Clark, but Jon figured it out. Overall, Jon is just a master at lying, deceiving, gaslighting and manipulating.

How would Clark react? Would he try and stop Jon?

And let's say Clark confronts Jon, subtly asking him about Jon's superhero alter ego, and Jon lies so well and convincingly that even with Clark's powers, he can't tell Jon is lying.