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It's not a spoiler but, for a safe side.
Uke is the first for Minho to feel something, "like", or something that matches his taste. His sis or mom (don't remember) pointed that out so, Minho realizes WJ takes a special spot in his mind. WJ learns to cook from their butler(?), but bcos of their closeness Minho bursted. Then, he misunderstood continuously and payback with Cheating, and dragged uke into 3some, and made him a slut. Till this point, it's all Minho's fault.
But, why did WJ slept with Minho in the first place when TH and he got into fight. That's the major mistake of him to do that. Later things that he slept with Minho is bcos of Minho's threatening him and we all can understand bcos he is that much stupid but, that first time is not forgiven.