Spoilers!!!
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for three, which if i remember correctly is CATCH ME, you need to start getting a bit suspicious of Chao and invite Owen to dig up Jane Avery's body. For four, (KNOW ME) (?) you need to basically do everything you can to romance Chao, especially when it comes to the decision of keeping the information between you and Chao after your meeting with Owen, investigate, but do it in a way that only you and Chao are involved. iirc anyway!