Yeah, there are consequences to killing and sparing him. Did you happen to change your last name? That offers a change to the mission if you happen to do so.
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Yeah I did go back and then decided to ask him questions instead of instantly killing him and yes I did change my mc name from wu to he but im planning on betraying the he clan,with mo long help which made me fail the mission but i do hope that he does become helpful down the road. I also told him that the he clan was responsible for him killing his lover so I do hope these options don't come bite me back,I know for sure the mc at their current state can't fight the demon queen and I feel like if choosing to kill him I might lock myself out later on and die to her,the way the author worded it felt weirdly omnious.