Many people always want to find a reliable person and then entrust their trust to them. But more important than finding a reliable person is designing a relationship structure that encourages reliability. Make the relationship a repeated game rather than a one-time transaction, make information as transparent and symmetric as possible, ensure that exiting has reasonable costs but is not impossible, and align the interests of both parties as much as possible. When cooperation is more valuable than betrayal, when transparency allows actions to be verified, and when interests naturally align, reliability no longer depends on character and morality but becomes a matter of natural selection. Truly stable relationships rely not on trust itself, but on a structure that can still protect both parties even if trust fails.