It was revealed in C3048, his actions against Ling Han is just part of a plan from Lin Luo(7th Tier Heavenly Venerable) and others except the 5 previous Genesis World era. He was given mission from Lin Luo and others to keep attacking Ling Han so that Ling Han have some sort of motivation to surpassed others. Of course the first time he met Ling Han, he truly wanted to killed Ling Han so Lin Luo decided to used this.
After this revelation, Ling Han attack Xin Qihu with the intent to kill but it's just a trick on Ling Han's part and of course Ling Han still beat up Xin Qihu since when they first met he wanted to killed Ling Han and after that, Ling Han call it even.