Jin-Soo is Very Inconsistent and Could Have Been Written Better

Note: I watched the show maybe 10 years ago and am on rewatch season 5.

Firstly, I think the acting of Jin is incredible and the actor did great.

I also love the character.

I just think the writing for him is inconsistent. He goes from jealous, angry, borderline abusive maniac, to shrugging off his wife's cheating instantly.

He also goes from knowing no English to being fluent in a few months.

edit: he was understanding English and speaking full sentences before the three years. also yes I watched the back story, but that doesn't explain the shift. he acts jealous anytime anyone on the island even looks at his wife. and then suddenly shrugs off her infidelity. it makes no sense.