Involved is related to Pay. Pay is the opposite of Stiff. 
Person is related to Affair. Affair is related to Problem. Problem is related to Solution. one thing you do when you Think is Solution. 
Involved <--RelatedTo--> Pay <--Antonym--> Stiff 
Person <--RelatedTo--> Affair <--RelatedTo--> Problem <--RelatedTo--> Solution <--HasSubevent-- Think 