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Xue Yang. The novel doesn't state that he's dead and as two demonic cultivators living in and around Golden Carp Tower, the possibility that they met is nonzero.

Jin Guangshan isn't above using his children as tools, so he could have made Mo Xuanyu follow an unorthodox path in private. Mo Xuanyu was also often secluded from the reat of the sect and thus could have successfully been cultivating the demonic path without anyone knowing.

Does Xue Yang have a reason to interact with him? Maybe, but it is possible.

Does Xue Yang have and overarching longing for connection that is vital to his character? Yeah.

Is Mo Xuanyu a near perfect candidate for a source of connection in this context? YEAH.

examples:

John William Waterhouse official site

You are enough

You are not evil or deserving of suffering because you made a selfish or bad choice as a child

If you did do something bad you can apologize for it and make amends, it does not have to weigh you down forever

You deserve to move on and find happiness

Your accomplishments (or lack thereof) do not make you any more or less worthy of love

You are on your own timeline for happiness

Your early 30s is still young for finding love and pursuing your dreams

You are not responsible for not stopping your own abuse that you suffered as a child

You will not become your abuser if you let yourself be angry about your abuse

You can and should feel angry and use a safe outlet for that anger

You don't need to be pure or virginal to deserve love

You deserve to have wants and needs and to have those heard

You deserve physical safety and you do not need to earn your place in your home

Just being with you is a gift

Your presence has made life worth living for other people

You have people who love and care about you in your life even when you don't think you deserve it