I have a question for the novel readers: Does the ml actually know that he is J?

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For now, he is not 100% sure, but he has suspicions

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Kinda he's looking for more evidence to prove his hunch

i think i ruined this first time doing this my apologies TT

Thank you for the answers, now it makes sense
Maybe can I ask for more spoilers? Anything is fine

Like how will he react when he found out and 100% sure, etc

i wanna know too