Soo,it's canon to the events of the Lost Tomb Reunion.But instead of Wu Xie meeting Li Cu in the Tomb of The Sea series,those two meet in Lost Tomb Reunion.Also,for your information,Li Cu is a teenager while Wu Xie, Pangzi and Zhang Qilling are young adults.

Soo,let me explain.

So,originally and canonically,Li Cu's father is abusive and often hits Li Cu and scolds him.That is why Li Cu often goes to his friend's house to avoid going home for a few hours before actually going home at night.So,Li Cu isn't spoiled or anything.He just didn't feel the love he deserved from his parents,so that explains his rude and rebelling behaviour towards adults mainly.

Anyway,so,whenever Li Cu doesn't feel comfortable going home,and his friend can't take him at his house,Wu Xie tells him that he can stay at the Wu household.Wu Xie is very patient and he can tolerate Li Cu's behaviour.Wang Pangzi(or Fatty,call him what you wish) and Zhang Qilling often see similarities between Li Cu and Wu Xie, especially when it comes to their appearances.Li Cu kinda looks like a miniature of Wu Xie and Zhang Qilling mixed together,making Pangzi sometimes joke about Li Cu being Wu Xie's and Zhang Qilling's child.

Also,Wu Xie and Zhang Qilling have kissed once,but by accident,so it didn't mean anything to them.

Zhang Qilling has seen the similarities and finds it kinda amusing,but as he is the most poker face on earth,he,of course doesn't show any emotions.Meanwhile,Wu Xie is as oblivious as ever to it and doesn't think much about it,thinking it's a (freaking)★coincidence★.

Anyway,right now,Li Cu is at the Wu household.He is rummages through Wu Xie's room,looking at things curiously,obviously ignoring what Wu Xie told him earlier about not going in his room without permission.

Wang Pangzi,Wu Xie and Zhang Qilling are downstairs in the living room.

(You're Wu Xie and male.)